Fix critical delete bug: don't mass-delete on EntryID change

Two fixes for delete propagation in Phase 1:

1. When Outlook contact not found by EntryID, try to re-match
   by name/email/phone before assuming it was deleted. Outlook
   can change EntryIDs on restart or profile changes, causing
   the sync to think ALL contacts were deleted.

2. When Starface contact not found in current list, DON'T delete
   from Outlook. The contact may belong to a different address
   book. Just drop the mapping and let Phase 2/3 re-link it.

These changes make delete propagation much safer and prevent
accidental mass-deletion of contacts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -42,6 +42,32 @@ Windows-Anwendung zur bidirektionalen Synchronisation von Kontakten zwischen Mic
 5. Starface-Adressbuch und Outlook-Kontaktordner waehlen
 6. Speichern und "Jetzt synchronisieren"
 
+### Outlook-Sicherheitsabfrage unterdruecken
+
+Beim Zugriff auf Outlook-Kontakte zeigt Outlook standardmaessig einen
+Sicherheitsdialog ("Ein Programm versucht auf Ihre E-Mail-Adressinformationen
+zuzugreifen"). Dieser kann in den Einstellungen der App deaktiviert werden:
+
+1. In der App auf "Einstellungen" klicken
+2. "Outlook-Sicherheitsabfrage automatisch erlauben" aktivieren
+3. Speichern
+
+**Auf Domaenen-PCs / Terminal Servern:**
+
+Die Outlook-Sicherheitseinstellungen werden dort per Gruppenrichtlinie (GPO)
+gesteuert und sind im Trust Center ausgegraut. In diesem Fall muss die App
+**einmalig als Administrator** gestartet werden, damit die Registry-Keys
+unter HKLM geschrieben werden koennen:
+
+1. Rechtsklick auf die App -> "Als Administrator ausfuehren"
+2. Einstellungen -> "Outlook-Sicherheitsabfrage automatisch erlauben" aktivieren
+3. Speichern und App schliessen
+4. Outlook neu starten
+5. App kann danach wieder normal (ohne Admin) gestartet werden
+
+Die Einstellung bleibt dauerhaft bestehen und gilt fuer alle Benutzer
+auf dem Rechner.
+
 ### Deinstallation
 
 Ueber Windows Einstellungen -> Apps oder die Systemsteuerung.

installer/setup.iss

@@ -2,7 +2,7 @@
 ; Erfordert Inno Setup 6.x (https://jrsoftware.org/isinfo.php)
 
 #define MyAppName "Starface Outlook Sync"
-#define MyAppVersion "0.0.0.2"
+#define MyAppVersion "0.0.0.23"
 #define MyAppPublisher "HackerSoft - Hacker-Net Telekommunikation"
 #define MyAppURL "https://www.hacker-net.de"
 #define MyAppExeName "StarfaceOutlookSync.exe"

src/StarfaceOutlookSync/Models/UserSettings.cs

@@ -0,0 +1,120 @@
+using System;
+using System.IO;
+using Microsoft.Win32;
+using Newtonsoft.Json;
+
+namespace StarfaceOutlookSync.Models
+{
+    public class UserSettings
+    {
+        public bool StartMinimized { get; set; } = false;
+        public bool SyncOnStart { get; set; } = false;
+        public bool AutoAcceptOutlookPrompt { get; set; } = false;
+
+        private static readonly string SettingsFile = Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+            "StarfaceOutlookSync", "settings.json");
+
+        public static UserSettings Load()
+        {
+            try
+            {
+                if (File.Exists(SettingsFile))
+                    return JsonConvert.DeserializeObject<UserSettings>(File.ReadAllText(SettingsFile))
+                           ?? new UserSettings();
+            }
+            catch { }
+            return new UserSettings();
+        }
+
+        public void Save()
+        {
+            try
+            {
+                Directory.CreateDirectory(Path.GetDirectoryName(SettingsFile));
+                File.WriteAllText(SettingsFile, JsonConvert.SerializeObject(this, Formatting.Indented));
+            }
+            catch { }
+
+            ApplyOutlookSecuritySetting();
+        }
+
+        public void ApplyOutlookSecuritySetting()
+        {
+            var versions = new[] { "16.0", "15.0" };
+
+            var securityValues = new (string name, int value)[]
+            {
+                ("ObjectModelGuard", 2),
+                ("PromptOOMAddressBookAccess", 2),
+                ("PromptOOMAddressInformationAccess", 2),
+                ("PromptOOMSend", 2),
+                ("PromptOOMSaveAs", 2),
+                ("PromptOOMFormulaAccess", 2),
+                ("PromptOOMCustomAction", 2),
+                ("PromptSimpleMAPISend", 2),
+                ("PromptSimpleMAPINameResolve", 2),
+                ("PromptSimpleMAPIOpenMessage", 2),
+                ("AdminSecurityMode", 3),
+            };
+
+            // In alle moeglichen Pfade schreiben (HKCU + HKLM, Policies + direkt)
+            var roots = new[] { Registry.CurrentUser, Registry.LocalMachine };
+            var prefixes = new[]
+            {
+                @"Software\Policies\Microsoft\Office",
+                @"Software\Microsoft\Office"
+            };
+
+            foreach (var ver in versions)
+            {
+                foreach (var root in roots)
+                {
+                    foreach (var prefix in prefixes)
+                    {
+                        var regPath = $@"{prefix}\{ver}\Outlook\Security";
+                        try
+                        {
+                            if (AutoAcceptOutlookPrompt)
+                            {
+                                var key = root.CreateSubKey(regPath);
+                                if (key != null)
+                                {
+                                    foreach (var (name, value) in securityValues)
+                                        key.SetValue(name, value, RegistryValueKind.DWord);
+                                    key.Close();
+                                }
+                            }
+                            else
+                            {
+                                try { root.DeleteSubKey(regPath, false); } catch { }
+                            }
+                        }
+                        catch { } // Kein Fehler wenn Rechte fehlen - naechsten Pfad versuchen
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Prueft ob die Outlook-Sicherheitseinstellung per GPO blockiert wird.
+        /// </summary>
+        public static bool IsOutlookSecurityLockedByPolicy()
+        {
+            try
+            {
+                // Wenn HKLM Policies gesetzt sind und wir dort nicht schreiben koennen
+                var key = Registry.LocalMachine.OpenSubKey(
+                    @"Software\Policies\Microsoft\Office\16.0\Outlook\Security", false);
+                if (key != null)
+                {
+                    var val = key.GetValue("AdminSecurityMode");
+                    key.Close();
+                    if (val != null) return true;
+                }
+            }
+            catch { }
+            return false;
+        }
+    }
+}

src/StarfaceOutlookSync/Services/OutlookContactsService.cs

@@ -2,44 +2,75 @@ using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using StarfaceOutlookSync.Models;
-using Outlook = Microsoft.Office.Interop.Outlook;
 
 namespace StarfaceOutlookSync.Services
 {
+    /// <summary>
+    /// Zugriff auf Outlook-Kontakte per dynamic COM.
+    /// Funktioniert mit jeder Outlook Classic Version (2013-2024)
+    /// ohne Abhaengigkeit von einer bestimmten Interop-DLL.
+    /// </summary>
     public class OutlookContactsService : IDisposable
     {
-        private Outlook.Application _outlookApp;
+        private dynamic _outlookApp;
         private bool _weStartedOutlook;
 
-        // Marshal.GetActiveObject existiert nicht in .NET 8, daher P/Invoke
+        // OlDefaultFolders.olFolderContacts = 10
+        private const int OlFolderContacts = 10;
+        // OlItemType.olContactItem = 2
+        private const int OlContactItem = 2;
+
         [DllImport("oleaut32.dll", PreserveSig = false)]
-        private static extern void GetActiveObject([MarshalAs(UnmanagedType.LPStruct)] Guid rclsid, IntPtr pvReserved, [MarshalAs(UnmanagedType.IUnknown)] out object ppunk);
+        private static extern void GetActiveObject(
+            [MarshalAs(UnmanagedType.LPStruct)] Guid rclsid,
+            IntPtr pvReserved,
+            [MarshalAs(UnmanagedType.IUnknown)] out object ppunk);
 
         private static object GetActiveComObject(string progId)
         {
-            var clsid = Type.GetTypeFromProgID(progId, true).GUID;
+            var type = Type.GetTypeFromProgID(progId, false);
-            GetActiveObject(clsid, IntPtr.Zero, out var obj);
+            if (type == null) return null;
+            GetActiveObject(type.GUID, IntPtr.Zero, out var obj);
             return obj;
         }
 
-        private Outlook.Application GetOutlookApp()
+        private dynamic GetOutlookApp()
         {
             if (_outlookApp != null) return _outlookApp;
 
+            // Versuch 1: Laufende Outlook-Instanz finden
             try
             {
-                // Versuche laufende Outlook-Instanz zu finden
+                var obj = GetActiveComObject("Outlook.Application");
-                _outlookApp = (Outlook.Application)GetActiveComObject("Outlook.Application");
+                if (obj != null)
-                _weStartedOutlook = false;
+                {
-            }
+                    _outlookApp = obj;
-            catch
+                    _weStartedOutlook = false;
-            {
+                    return _outlookApp;
-                // Outlook starten falls nicht laufend
+                }
-                _outlookApp = new Outlook.Application();
-                _weStartedOutlook = true;
             }
+            catch { }
 
-            return _outlookApp;
+            // Versuch 2: Outlook per COM starten
+            try
+            {
+                var outlookType = Type.GetTypeFromProgID("Outlook.Application", false);
+                if (outlookType != null)
+                {
+                    _outlookApp = Activator.CreateInstance(outlookType);
+                    _weStartedOutlook = true;
+                    return _outlookApp;
+                }
+            }
+            catch { }
+
+            throw new InvalidOperationException(
+                "Outlook Classic konnte nicht gefunden werden.\n\n" +
+                "Moegliche Ursachen:\n" +
+                "- Outlook Classic ist nicht installiert\n" +
+                "- Outlook Classic ist nicht gestartet\n" +
+                "- Das neue Outlook wird verwendet (wird noch nicht unterstuetzt)\n\n" +
+                "Bitte Outlook Classic starten und erneut versuchen.");
         }
 
         public List<string> GetContactFolderPaths()
@@ -50,128 +81,235 @@ namespace StarfaceOutlookSync.Services
                 var app = GetOutlookApp();
                 var ns = app.GetNamespace("MAPI");
 
-                // Standard-Kontaktordner
+                // Alle Stores durchgehen
-                var defaultFolder = ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
+                var stores = ns.Stores;
-                folders.Add(defaultFolder.FolderPath);
+                for (int i = 1; i <= (int)stores.Count; i++)
-
-                // Unterordner
-                AddSubFolders(defaultFolder, folders);
-
-                // Weitere Kontaktordner in anderen Stores
-                foreach (Outlook.Store store in ns.Stores)
                 {
                     try
                     {
+                        var store = stores[i];
                         var rootFolder = store.GetRootFolder();
-                        FindContactFolders(rootFolder, folders);
+                        FindContactFoldersRecursive(rootFolder, folders);
+                        Marshal.ReleaseComObject(rootFolder);
+                        Marshal.ReleaseComObject(store);
+                    }
+                    catch (Exception ex)
+                    {
+                        System.Diagnostics.Debug.WriteLine($"Error scanning store {i}: {ex.Message}");
+                    }
+                }
+
+                // Falls nichts gefunden, Standard-Kontaktordner als Fallback
+                if (folders.Count == 0)
+                {
+                    try
+                    {
+                        var defaultFolder = ns.GetDefaultFolder(OlFolderContacts);
+                        folders.Add((string)defaultFolder.FolderPath);
+                        Marshal.ReleaseComObject(defaultFolder);
                     }
                     catch { }
                 }
 
+                Marshal.ReleaseComObject(stores);
                 Marshal.ReleaseComObject(ns);
             }
             catch (Exception ex)
             {
                 System.Diagnostics.Debug.WriteLine($"Error getting folders: {ex.Message}");
+                throw;
             }
 
             return folders;
         }
 
-        private void AddSubFolders(Outlook.MAPIFolder folder, List<string> paths)
+        private void FindContactFoldersRecursive(dynamic folder, List<string> paths)
         {
-            foreach (Outlook.MAPIFolder sub in folder.Folders)
+            try
             {
-                if (sub.DefaultItemType == Outlook.OlItemType.olContactItem)
+                if ((int)folder.DefaultItemType == OlContactItem)
                 {
-                    if (!paths.Contains(sub.FolderPath))
+                    string path = folder.FolderPath;
-                        paths.Add(sub.FolderPath);
+                    if (!paths.Contains(path))
-                    AddSubFolders(sub, paths);
+                        paths.Add(path);
                 }
+
+                var subFolders = folder.Folders;
+                for (int i = 1; i <= (int)subFolders.Count; i++)
+                {
+                    try
+                    {
+                        var sub = subFolders[i];
+                        FindContactFoldersRecursive(sub, paths);
+                        Marshal.ReleaseComObject(sub);
+                    }
+                    catch { }
+                }
+                Marshal.ReleaseComObject(subFolders);
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"Error scanning folder: {ex.Message}");
             }
         }
 
-        private void FindContactFolders(Outlook.MAPIFolder folder, List<string> paths)
+        private dynamic FindFolderByPath(dynamic folder, string targetPath)
         {
-            if (folder.DefaultItemType == Outlook.OlItemType.olContactItem)
+            try
             {
-                if (!paths.Contains(folder.FolderPath))
+                string currentPath = folder.FolderPath;
-                    paths.Add(folder.FolderPath);
+                if (currentPath == targetPath)
-            }
+                    return folder;
 
-            foreach (Outlook.MAPIFolder sub in folder.Folders)
+                var subs = folder.Folders;
-            {
+                for (int i = 1; i <= (int)subs.Count; i++)
-                FindContactFolders(sub, paths);
+                {
+                    try
+                    {
+                        var sub = subs[i];
+                        var match = FindFolderByPath(sub, targetPath);
+                        if (match != null) return match;
+                        Marshal.ReleaseComObject(sub);
+                    }
+                    catch { }
+                }
+                Marshal.ReleaseComObject(subs);
             }
+            catch { }
+            return null;
         }
 
-        private Outlook.MAPIFolder GetFolderByPath(string folderPath)
+        private dynamic GetFolderByPath(string folderPath)
         {
             var app = GetOutlookApp();
             var ns = app.GetNamespace("MAPI");
 
-            // Standard-Kontaktordner als Fallback
             if (string.IsNullOrEmpty(folderPath))
-                return ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
+                return ns.GetDefaultFolder(OlFolderContacts);
 
             try
             {
-                // Pfad durchlaufen
+                // Versuch 1: Alle Kontaktordner durchsuchen und per FolderPath matchen
-                var parts = folderPath.Split(new[] { '\\' }, StringSplitOptions.RemoveEmptyEntries);
+                var stores = ns.Stores;
-                Outlook.MAPIFolder current = null;
+                for (int i = 1; i <= (int)stores.Count; i++)
-
-                foreach (Outlook.Store store in ns.Stores)
                 {
-                    if (store.GetRootFolder().Name == parts[0] ||
+                    try
-                        store.GetRootFolder().FolderPath.TrimStart('\\') == parts[0])
                     {
-                        current = store.GetRootFolder();
+                        var store = stores[i];
-                        break;
+                        var root = store.GetRootFolder();
-                    }
+                        var match = FindFolderByPath(root, folderPath);
-                }
+                        if (match != null)
-
-                if (current == null)
-                    return ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
-
-                for (int i = 1; i < parts.Length; i++)
-                {
-                    bool found = false;
-                    foreach (Outlook.MAPIFolder sub in current.Folders)
-                    {
-                        if (sub.Name == parts[i])
                         {
-                            current = sub;
+                            Marshal.ReleaseComObject(stores);
-                            found = true;
+                            return match;
-                            break;
                         }
+                        Marshal.ReleaseComObject(root);
+                        Marshal.ReleaseComObject(store);
                     }
-                    if (!found)
+                    catch { }
-                        return ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
+                }
+                Marshal.ReleaseComObject(stores);
+
+                // Versuch 2: Namespace.Folders direkt navigieren
+                var parts = folderPath.Split(new[] { '\\' }, StringSplitOptions.RemoveEmptyEntries);
+                if (parts.Length >= 1)
+                {
+                    var topFolders = ns.Folders;
+                    for (int i = 1; i <= (int)topFolders.Count; i++)
+                    {
+                        var topFolder = topFolders[i];
+                        if ((string)topFolder.Name == parts[0])
+                        {
+                            dynamic current = topFolder;
+                            for (int p = 1; p < parts.Length; p++)
+                            {
+                                bool found = false;
+                                var subs = current.Folders;
+                                for (int j = 1; j <= (int)subs.Count; j++)
+                                {
+                                    var sub = subs[j];
+                                    if ((string)sub.Name == parts[p])
+                                    {
+                                        current = sub;
+                                        found = true;
+                                        break;
+                                    }
+                                    Marshal.ReleaseComObject(sub);
+                                }
+                                Marshal.ReleaseComObject(subs);
+                                if (!found) { current = null; break; }
+                            }
+                            if (current != null)
+                            {
+                                Marshal.ReleaseComObject(topFolders);
+                                return current;
+                            }
+                        }
+                        Marshal.ReleaseComObject(topFolder);
+                    }
+                    Marshal.ReleaseComObject(topFolders);
                 }
 
-                return current;
+                System.Diagnostics.Debug.WriteLine($"Folder not found by path: {folderPath}, using default");
+                return ns.GetDefaultFolder(OlFolderContacts);
             }
             catch
             {
-                return ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);
+                return ns.GetDefaultFolder(OlFolderContacts);
             }
         }
 
         public List<UnifiedContact> GetContacts(string folderPath)
         {
             var contacts = new List<UnifiedContact>();
-
             try
             {
                 var folder = GetFolderByPath(folderPath);
-                var items = folder.Items;
+                System.Diagnostics.Debug.WriteLine($"Reading contacts from: {(string)folder.FolderPath}");
 
-                foreach (var item in items)
+                var items = folder.Items;
+                int count = (int)items.Count;
+                System.Diagnostics.Debug.WriteLine($"Items count: {count}");
+
+                for (int i = 1; i <= count; i++)
                 {
-                    if (item is Outlook.ContactItem ci)
+                    dynamic item = null;
+                    try
                     {
-                        contacts.Add(MapFromOutlook(ci));
+                        item = items[i];
-                        Marshal.ReleaseComObject(ci);
+                        int itemClass = -1;
+                        try { itemClass = (int)item.Class; } catch { }
+
+                        // olContact = 40, aber manche Kontakte melden Class anders
+                        // Versuch einfach die Kontakt-Felder zu lesen
+                        if (itemClass == 40)
+                        {
+                            contacts.Add(MapFromOutlook(item));
+                        }
+                        else
+                        {
+                            // Fallback: Pruefen ob es trotzdem ein Kontakt ist
+                            try
+                            {
+                                string eid = item.EntryID;
+                                string fn = item.FirstName;
+                                string ln = item.LastName;
+                                // Hat Kontakt-Felder -> ist ein Kontakt
+                                contacts.Add(MapFromOutlook(item));
+                            }
+                            catch
+                            {
+                                // Kein Kontakt, ueberspringen
+                            }
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        System.Diagnostics.Debug.WriteLine($"Error reading item {i}: {ex.Message}");
+                    }
+                    finally
+                    {
+                        if (item != null) try { Marshal.ReleaseComObject(item); } catch { }
                     }
                 }
 
@@ -191,7 +329,8 @@ namespace StarfaceOutlookSync.Services
             try
             {
                 var folder = GetFolderByPath(folderPath);
-                var ci = (Outlook.ContactItem)folder.Items.Add(Outlook.OlItemType.olContactItem);
+                var items = folder.Items;
+                dynamic ci = items.Add(OlContactItem);
 
                 MapToOutlook(contact, ci);
                 ci.Save();
@@ -199,6 +338,7 @@ namespace StarfaceOutlookSync.Services
                 contact.OutlookEntryId = ci.EntryID;
 
                 Marshal.ReleaseComObject(ci);
+                Marshal.ReleaseComObject(items);
                 Marshal.ReleaseComObject(folder);
 
                 return contact;
@@ -216,7 +356,7 @@ namespace StarfaceOutlookSync.Services
             {
                 var app = GetOutlookApp();
                 var ns = app.GetNamespace("MAPI");
-                var ci = (Outlook.ContactItem)ns.GetItemFromID(entryId);
+                dynamic ci = ns.GetItemFromID(entryId);
 
                 MapToOutlook(contact, ci);
                 ci.Save();
@@ -239,7 +379,7 @@ namespace StarfaceOutlookSync.Services
             {
                 var app = GetOutlookApp();
                 var ns = app.GetNamespace("MAPI");
-                var ci = (Outlook.ContactItem)ns.GetItemFromID(entryId);
+                dynamic ci = ns.GetItemFromID(entryId);
 
                 ci.Delete();
                 Marshal.ReleaseComObject(ci);
@@ -254,36 +394,58 @@ namespace StarfaceOutlookSync.Services
             }
         }
 
-        private UnifiedContact MapFromOutlook(Outlook.ContactItem ci)
+        private static string SafeGet(dynamic ci, string property)
+        {
+            try
+            {
+                object val = ci.GetType().InvokeMember(property,
+                    System.Reflection.BindingFlags.GetProperty, null, ci, null);
+                return val?.ToString() ?? "";
+            }
+            catch { return ""; }
+        }
+
+        private UnifiedContact MapFromOutlook(dynamic ci)
         {
             return new UnifiedContact
             {
-                OutlookEntryId = ci.EntryID ?? "",
+                OutlookEntryId = SafeGet(ci, "EntryID"),
-                FirstName = ci.FirstName ?? "",
+                FirstName = SafeGet(ci, "FirstName"),
-                LastName = ci.LastName ?? "",
+                LastName = SafeGet(ci, "LastName"),
-                Company = ci.CompanyName ?? "",
+                Company = SafeGet(ci, "CompanyName"),
-                JobTitle = ci.JobTitle ?? "",
+                JobTitle = SafeGet(ci, "JobTitle"),
-                Email = ci.Email1Address ?? "",
+                Email = SafeGet(ci, "Email1Address"),
-                EmailSecondary = ci.Email2Address ?? "",
+                EmailSecondary = SafeGet(ci, "Email2Address"),
-                PhoneWork = ci.BusinessTelephoneNumber ?? "",
+                PhoneWork = SafeGet(ci, "BusinessTelephoneNumber"),
-                PhoneMobile = ci.MobileTelephoneNumber ?? "",
+                PhoneMobile = SafeGet(ci, "MobileTelephoneNumber"),
-                PhoneHome = ci.HomeTelephoneNumber ?? "",
+                PhoneHome = SafeGet(ci, "HomeTelephoneNumber"),
-                Fax = ci.BusinessFaxNumber ?? "",
+                Fax = SafeGet(ci, "BusinessFaxNumber"),
-                Street = ci.BusinessAddressStreet ?? "",
+                Street = SafeGet(ci, "BusinessAddressStreet"),
-                City = ci.BusinessAddressCity ?? "",
+                City = SafeGet(ci, "BusinessAddressCity"),
-                PostalCode = ci.BusinessAddressPostalCode ?? "",
+                PostalCode = SafeGet(ci, "BusinessAddressPostalCode"),
-                State = ci.BusinessAddressState ?? "",
+                State = SafeGet(ci, "BusinessAddressState"),
-                Country = ci.BusinessAddressCountry ?? "",
+                Country = SafeGet(ci, "BusinessAddressCountry"),
-                Website = ci.WebPage ?? "",
+                Website = SafeGet(ci, "WebPage"),
-                Notes = ci.Body ?? "",
+                Notes = SafeGet(ci, "Body"),
-                Salutation = ci.Title ?? "",
+                Salutation = SafeGet(ci, "Title"),
-                Title = ci.Suffix ?? "",
+                Birthday = GetBirthdayString(ci)
-                Birthday = ci.Birthday != DateTime.MinValue && ci.Birthday.Year > 1900
-                    ? ci.Birthday.ToString("yyyy-MM-dd") : ""
             };
         }
 
-        private void MapToOutlook(UnifiedContact contact, Outlook.ContactItem ci)
+        private string GetBirthdayString(dynamic ci)
+        {
+            try
+            {
+                object val = ci.GetType().InvokeMember("Birthday",
+                    System.Reflection.BindingFlags.GetProperty, null, ci, null);
+                if (val is DateTime bday && bday.Year > 1900 && bday != DateTime.MinValue)
+                    return bday.ToString("yyyy-MM-dd");
+            }
+            catch { }
+            return "";
+        }
+
+        private void MapToOutlook(UnifiedContact contact, dynamic ci)
         {
             ci.FirstName = contact.FirstName;
             ci.LastName = contact.LastName;
@@ -320,7 +482,7 @@ namespace StarfaceOutlookSync.Services
                 {
                     try { _outlookApp.Quit(); } catch { }
                 }
-                Marshal.ReleaseComObject(_outlookApp);
+                try { Marshal.ReleaseComObject(_outlookApp); } catch { }
                 _outlookApp = null;
             }
         }

src/StarfaceOutlookSync/Services/StarfaceApiClient.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net;
 using System.Net.Http;
 using System.Security.Cryptography;
@@ -115,51 +116,74 @@ namespace StarfaceOutlookSync.Services
         {
             var books = new List<StarfaceAddressBook>();
 
-            books.Add(new StarfaceAddressBook
+            // Alle Tags laden - die Starface nutzt Tags als Adressbuch-Zuordnung
-            {
+            var allTags = new JArray();
-                Type = "central",
-                Name = "Zentrales Adressbuch"
-            });
-
-            var userId = await GetCurrentUserIdAsync();
-            if (!string.IsNullOrEmpty(userId))
-            {
-                books.Add(new StarfaceAddressBook
-                {
-                    Type = "user",
-                    UserId = userId,
-                    Name = "Persoenliches Adressbuch"
-                });
-            }
-
-            // Tags als virtuelle Adressbuecher
             try
             {
                 var resp = await _http.GetAsync($"{_baseUrl}/contacts/tags");
                 if (resp.IsSuccessStatusCode)
                 {
-                    var tags = JArray.Parse(await resp.Content.ReadAsStringAsync());
+                    allTags = JArray.Parse(await resp.Content.ReadAsStringAsync());
-                    foreach (var tag in tags)
+                    OnDebug?.Invoke($"Gefundene Tags: {allTags.Count}");
-                    {
+                    foreach (var t in allTags)
-                        books.Add(new StarfaceAddressBook
+                        OnDebug?.Invoke($"  Tag: {t["name"]} (id: {t["id"]}, alias: {t["alias"]}, owner: {t["owner"]})");
-                        {
-                            Type = "tag",
-                            TagId = tag["id"]?.ToString() ?? "",
-                            Name = $"Tag: {tag["name"]}"
-                        });
-                    }
                 }
             }
             catch { }
 
+            // Zentrales Adressbuch (folder/all)
+            var allTag = allTags.FirstOrDefault(t => t["name"]?.ToString() == "folder/all"
+                                                  || t["alias"]?.ToString()?.Contains("folder.all") == true);
+            books.Add(new StarfaceAddressBook
+            {
+                Type = "central",
+                TagId = allTag?["id"]?.ToString() ?? "",
+                Name = "Zentrales Adressbuch"
+            });
+
+            // Persoenliches Adressbuch (folder/private mit owner = userId)
+            var userId = await GetCurrentUserIdAsync();
+            if (!string.IsNullOrEmpty(userId))
+            {
+                var privateTag = allTags.FirstOrDefault(t =>
+                    (t["name"]?.ToString() == "folder/private" || t["alias"]?.ToString()?.Contains("folder.private") == true)
+                    && t["owner"]?.ToString() == userId);
+
+                books.Add(new StarfaceAddressBook
+                {
+                    Type = "user",
+                    UserId = userId,
+                    TagId = privateTag?["id"]?.ToString() ?? "",
+                    Name = "Persoenliches Adressbuch"
+                });
+            }
+
+            // Alle weiteren Tags als Adressbuecher anbieten
+            foreach (var tag in allTags)
+            {
+                var tagName = tag["name"]?.ToString() ?? "";
+                // folder/all und folder/private bereits oben erfasst
+                if (tagName == "folder/all" || tagName == "folder/private") continue;
+
+                books.Add(new StarfaceAddressBook
+                {
+                    Type = "tag",
+                    TagId = tag["id"]?.ToString() ?? "",
+                    Name = tagName
+                });
+            }
+
             return books;
         }
 
+        public event Action<string> OnDebug;
+
         public async Task<List<UnifiedContact>> GetContactsAsync(StarfaceAddressBook book)
         {
             var contacts = new List<UnifiedContact>();
             int page = 0;
             const int pageSize = 200;
+            bool firstPage = true;
 
             while (true)
             {
@@ -172,11 +196,68 @@ namespace StarfaceOutlookSync.Services
                 var resp = await _http.GetAsync($"{_baseUrl}/contacts?{query}");
                 if (!resp.IsSuccessStatusCode) break;
 
-                var array = JArray.Parse(await resp.Content.ReadAsStringAsync());
+                var body = await resp.Content.ReadAsStringAsync();
+                JArray array;
+
+                // Die API gibt je nach Version ein Array oder ein Objekt mit "items" zurueck
+                var token = JToken.Parse(body);
+                if (token is JArray directArray)
+                {
+                    array = directArray;
+                }
+                else if (token is JObject obj)
+                {
+                    // Versuche gaengige Felder: items, contacts, data, results
+                    array = (obj["items"] ?? obj["contacts"] ?? obj["data"] ?? obj["results"]) as JArray;
+                    if (array == null)
+                    {
+                        // Einzelnes Kontakt-Objekt? Dann in Array wrappen
+                        if (obj["id"] != null && obj["blocks"] != null)
+                        {
+                            array = new JArray { obj };
+                        }
+                        else
+                        {
+                            System.Diagnostics.Debug.WriteLine($"Unerwartete Starface-Antwort: {body.Substring(0, Math.Min(200, body.Length))}");
+                            break;
+                        }
+                    }
+                }
+                else
+                {
+                    break;
+                }
+
                 if (array.Count == 0) break;
 
+                OnDebug?.Invoke($"Seite {page}: {array.Count} Kontakte in Liste");
+
+                // Die Listen-API gibt nur Summary zurueck.
+                // Jeden Kontakt einzeln abrufen fuer alle Felder.
                 foreach (var item in array)
-                    contacts.Add(MapFromStarface(item));
+                {
+                    var id = item["id"]?.ToString();
+                    if (string.IsNullOrEmpty(id)) continue;
+
+                    try
+                    {
+                        var detailResp = await _http.GetAsync($"{_baseUrl}/contacts/{id}");
+                        if (detailResp.IsSuccessStatusCode)
+                        {
+                            var detailBody = await detailResp.Content.ReadAsStringAsync();
+                            var detailObj = JObject.Parse(detailBody);
+
+                            if (firstPage)
+                            {
+                                OnDebug?.Invoke($"Starface Kontakt-Detail (1. Kontakt):\n{detailObj.ToString(Formatting.Indented)}");
+                                firstPage = false;
+                            }
+
+                            contacts.Add(MapFromStarface(detailObj));
+                        }
+                    }
+                    catch { }
+                }
 
                 if (array.Count < pageSize) break;
                 page++;
@@ -188,15 +269,34 @@ namespace StarfaceOutlookSync.Services
         public async Task<UnifiedContact> CreateContactAsync(UnifiedContact contact, StarfaceAddressBook book)
         {
             var sfContact = MapToStarface(contact);
+
+            // Tag zuweisen - die Starface verlangt dass jeder Kontakt einem Tag zugeordnet ist
+            if (!string.IsNullOrEmpty(book.TagId))
+            {
+                sfContact["tags"] = new JArray
+                {
+                    new JObject { ["id"] = book.TagId }
+                };
+            }
+
             var query = "";
             if (book.Type == "user" && !string.IsNullOrEmpty(book.UserId))
                 query = $"?userId={book.UserId}";
 
-            var content = new StringContent(sfContact.ToString(), Encoding.UTF8, "application/json");
+            var body = sfContact.ToString();
-            var resp = await _http.PostAsync($"{_baseUrl}/contacts{query}", content);
+            OnDebug?.Invoke($"POST /contacts{query} Body:\n{body}");
-            if (!resp.IsSuccessStatusCode) return null;
 
-            var created = JObject.Parse(await resp.Content.ReadAsStringAsync());
+            var content = new StringContent(body, Encoding.UTF8, "application/json");
+            var resp = await _http.PostAsync($"{_baseUrl}/contacts{query}", content);
+            var respBody = await resp.Content.ReadAsStringAsync();
+
+            if (!resp.IsSuccessStatusCode)
+            {
+                OnDebug?.Invoke($"POST /contacts fehlgeschlagen: {(int)resp.StatusCode} {resp.StatusCode}\n{respBody}");
+                return null;
+            }
+
+            var created = JObject.Parse(respBody);
             return MapFromStarface(created);
         }
 
@@ -204,12 +304,27 @@ namespace StarfaceOutlookSync.Services
         {
             var sfContact = MapToStarface(contact);
             sfContact["id"] = contactId;
+
+            // Tag beibehalten
+            if (!string.IsNullOrEmpty(book.TagId))
+            {
+                sfContact["tags"] = new JArray { new JObject { ["id"] = book.TagId } };
+            }
+
             var query = "";
             if (book.Type == "user" && !string.IsNullOrEmpty(book.UserId))
                 query = $"?userId={book.UserId}";
 
-            var content = new StringContent(sfContact.ToString(), Encoding.UTF8, "application/json");
+            var body = sfContact.ToString();
+            var content = new StringContent(body, Encoding.UTF8, "application/json");
             var resp = await _http.PutAsync($"{_baseUrl}/contacts/{contactId}{query}", content);
+
+            if (!resp.IsSuccessStatusCode)
+            {
+                var respBody = await resp.Content.ReadAsStringAsync();
+                OnDebug?.Invoke($"PUT /contacts/{contactId} fehlgeschlagen: {(int)resp.StatusCode}\n{respBody}");
+            }
+
             return resp.IsSuccessStatusCode;
         }
 
@@ -224,7 +339,10 @@ namespace StarfaceOutlookSync.Services
             var contact = new UnifiedContact();
             contact.StarfaceId = item["id"]?.ToString() ?? "";
 
-            var attrs = new Dictionary<string, string>();
+            // Attribute per "name"-Feld mappen (zuverlaessiger als displayKey,
+            // weil viele Felder USER_DEFINED als displayKey haben)
+            var byName = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+            var byDisplayKey = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
             var blocks = item["blocks"] as JArray;
             if (blocks != null)
             {
@@ -234,79 +352,123 @@ namespace StarfaceOutlookSync.Services
                     if (blockAttrs == null) continue;
                     foreach (var attr in blockAttrs)
                     {
-                        var key = attr["displayKey"]?.ToString() ?? "";
+                        var name = attr["name"]?.ToString() ?? "";
+                        var displayKey = attr["displayKey"]?.ToString() ?? "";
                         var val = attr["value"]?.ToString() ?? "";
                         if (!string.IsNullOrEmpty(val))
-                            attrs[key] = val;
+                        {
+                            if (!string.IsNullOrEmpty(name))
+                                byName[name] = val;
+                            // displayKey nur als Fallback (viele sind USER_DEFINED)
+                            if (!string.IsNullOrEmpty(displayKey) && displayKey != "USER_DEFINED")
+                                byDisplayKey[displayKey] = val;
+                        }
                     }
                 }
             }
 
-            contact.FirstName = attrs.GetValueOrDefault("NAME", "");
+            // Primaer nach name-Feld mappen, Fallback auf displayKey
-            contact.LastName = attrs.GetValueOrDefault("SURNAME", "");
+            string Get(string name, string displayKey = null)
-            contact.Company = attrs.GetValueOrDefault("COMPANY", "");
+            {
-            contact.JobTitle = attrs.GetValueOrDefault("JOB_TITLE", "");
+                if (byName.TryGetValue(name, out var v)) return v;
-            contact.Email = attrs.GetValueOrDefault("EMAIL", "");
+                if (displayKey != null && byDisplayKey.TryGetValue(displayKey, out v)) return v;
-            contact.PhoneWork = attrs.GetValueOrDefault("OFFICE_PHONE_NUMBER", "");
+                return "";
-            contact.PhoneMobile = attrs.GetValueOrDefault("MOBILE_PHONE_NUMBER", "");
+            }
-            contact.PhoneHome = attrs.GetValueOrDefault("PRIVATE_PHONE_NUMBER", "");
+
-            contact.Fax = attrs.GetValueOrDefault("FAX_NUMBER", "");
+            contact.FirstName = Get("firstname", "NAME");
-            contact.Street = attrs.GetValueOrDefault("STREET", "");
+            contact.LastName = Get("familyname", "SURNAME");
-            contact.City = attrs.GetValueOrDefault("CITY", "");
+            contact.Company = Get("company", "COMPANY");
-            contact.PostalCode = attrs.GetValueOrDefault("POSTAL_CODE", "");
+            contact.JobTitle = Get("jobtitle", "JOB_TITLE");
-            contact.State = attrs.GetValueOrDefault("STATE", "");
+            contact.Email = Get("e-mail", "EMAIL");
-            contact.Country = attrs.GetValueOrDefault("COUNTRY", "");
+            contact.PhoneWork = Get("phone", "PHONE_NUMBER");
-            contact.Website = attrs.GetValueOrDefault("URL", "");
+            contact.PhoneMobile = Get("mobile", "MOBILE_PHONE_NUMBER");
-            contact.Notes = attrs.GetValueOrDefault("NOTE", "");
+            contact.PhoneHome = Get("homephone", "PRIVATE_PHONE_NUMBER");
-            contact.Salutation = attrs.GetValueOrDefault("SALUTATION", "");
+            contact.Fax = Get("fax", "FAX_NUMBER");
-            contact.Title = attrs.GetValueOrDefault("TITLE", "");
+            contact.Street = Get("street", "STREET");
-            contact.Birthday = attrs.GetValueOrDefault("BIRTHDAY", "");
+            contact.City = Get("city", "CITY");
+            contact.PostalCode = Get("postcode", "POSTAL_CODE");
+            contact.State = Get("state", "STATE");
+            contact.Country = Get("country", "COUNTRY");
+            contact.Website = Get("url", "URL");
+            contact.Notes = Get("comment", "NOTE");
+            contact.Salutation = Get("salutation", "SALUTATION");
+            contact.Title = Get("title", "TITLE");
+            contact.Birthday = Get("birthday", "BIRTHDAY");
 
             return contact;
         }
 
         private JObject MapToStarface(UnifiedContact contact)
         {
-            var attrs = new JArray();
+            JArray MakeAttrs(params (string displayKey, string name, string value)[] fields)
-
-            void AddAttr(string displayKey, string name, string value)
             {
-                if (!string.IsNullOrEmpty(value))
+                var arr = new JArray();
-                    attrs.Add(new JObject { ["displayKey"] = displayKey, ["name"] = name, ["value"] = value });
+                foreach (var (dk, n, v) in fields)
+                {
+                    if (!string.IsNullOrEmpty(v))
+                        arr.Add(new JObject { ["displayKey"] = dk, ["name"] = n, ["value"] = v });
+                }
+                return arr;
             }
 
-            AddAttr("NAME", "firstName", contact.FirstName);
+            // Block-Struktur wie von der Starface erwartet
-            AddAttr("SURNAME", "lastName", contact.LastName);
+            var contactBlock = MakeAttrs(
-            AddAttr("COMPANY", "company", contact.Company);
+                ("NAME", "firstname", contact.FirstName),
-            AddAttr("JOB_TITLE", "jobTitle", contact.JobTitle);
+                ("SURNAME", "familyname", contact.LastName),
-            AddAttr("EMAIL", "email", contact.Email);
+                ("COMPANY", "company", contact.Company)
-            AddAttr("OFFICE_PHONE_NUMBER", "businessPhone", contact.PhoneWork);
+            );
-            AddAttr("MOBILE_PHONE_NUMBER", "mobilePhone", contact.PhoneMobile);
+
-            AddAttr("PRIVATE_PHONE_NUMBER", "homePhone", contact.PhoneHome);
+            var addressBlock = MakeAttrs(
-            AddAttr("FAX_NUMBER", "fax", contact.Fax);
+                ("USER_DEFINED", "street", contact.Street),
-            AddAttr("STREET", "street", contact.Street);
+                ("POSTAL_CODE", "postcode", contact.PostalCode),
-            AddAttr("CITY", "city", contact.City);
+                ("USER_DEFINED", "city", contact.City),
-            AddAttr("POSTAL_CODE", "postalCode", contact.PostalCode);
+                ("USER_DEFINED", "state", contact.State),
-            AddAttr("STATE", "state", contact.State);
+                ("USER_DEFINED", "country", contact.Country)
-            AddAttr("COUNTRY", "country", contact.Country);
+            );
-            AddAttr("URL", "website", contact.Website);
+
-            AddAttr("NOTE", "notes", contact.Notes);
+            var phoneBlock = MakeAttrs(
-            AddAttr("SALUTATION", "salutation", contact.Salutation);
+                ("PHONE_NUMBER", "phone", contact.PhoneWork),
-            AddAttr("TITLE", "title", contact.Title);
+                ("PRIVATE_PHONE_NUMBER", "homephone", contact.PhoneHome),
-            AddAttr("BIRTHDAY", "birthday", contact.Birthday);
+                ("MOBILE_PHONE_NUMBER", "mobile", contact.PhoneMobile),
+                ("FAX_NUMBER", "fax", contact.Fax)
+            );
+
+            var emailBlock = MakeAttrs(
+                ("EMAIL", "e-mail", contact.Email),
+                ("URL", "url", contact.Website),
+                ("USER_DEFINED", "comment", contact.Notes)
+            );
+
+            var blocks = new JArray();
+            blocks.Add(new JObject
+            {
+                ["name"] = "contact",
+                ["resourceKey"] = "de.vertico.starface.addressbook.block.label_contact",
+                ["attributes"] = contactBlock
+            });
+            blocks.Add(new JObject
+            {
+                ["name"] = "address",
+                ["resourceKey"] = "de.vertico.starface.addressbook.block.label_address",
+                ["attributes"] = addressBlock
+            });
+            blocks.Add(new JObject
+            {
+                ["name"] = "telephone",
+                ["resourceKey"] = "de.vertico.starface.addressbook.block.label_telephone",
+                ["attributes"] = phoneBlock
+            });
+            blocks.Add(new JObject
+            {
+                ["name"] = "email",
+                ["resourceKey"] = "de.vertico.starface.addressbook.block.label_email",
+                ["attributes"] = emailBlock
+            });
 
             return new JObject
             {
                 ["id"] = contact.StarfaceId ?? "",
-                ["blocks"] = new JArray
+                ["blocks"] = blocks
-                {
-                    new JObject
-                    {
-                        ["name"] = "contact",
-                        ["resourceKey"] = "contact",
-                        ["attributes"] = attrs
-                    }
-                }
             };
         }
 

src/StarfaceOutlookSync/Services/SyncEngine.cs

@@ -15,30 +15,103 @@ namespace StarfaceOutlookSync.Services
 
         private void Log(string message) => OnProgress?.Invoke(message);
 
+        /// <summary>
+        /// Findet einen passenden Kontakt in der Kandidatenliste.
+        /// Strenges Matching: Felder die auf einer Seite gefuellt sind muessen
+        /// auf der anderen auch gefuellt (und gleich) sein.
+        /// Ein leeres Feld auf einer Seite und ein gefuelltes auf der anderen
+        /// bedeutet: verschiedene Kontakte.
+        /// </summary>
         private static UnifiedContact FindMatch(UnifiedContact contact, List<UnifiedContact> candidates)
         {
-            // Erst E-Mail-Match
+            if (candidates == null || candidates.Count == 0) return null;
-            if (!string.IsNullOrEmpty(contact.Email))
-            {
-                var byEmail = candidates.FirstOrDefault(c =>
-                    !string.IsNullOrEmpty(c.Email) &&
-                    c.Email.Equals(contact.Email, StringComparison.OrdinalIgnoreCase));
-                if (byEmail != null) return byEmail;
-            }
 
-            // Dann Name-Match
+            foreach (var c in candidates)
-            if (!string.IsNullOrEmpty(contact.FirstName) || !string.IsNullOrEmpty(contact.LastName))
             {
-                var byName = candidates.FirstOrDefault(c =>
+                if (IsMatch(contact, c))
-                    c.FirstName.Equals(contact.FirstName, StringComparison.OrdinalIgnoreCase) &&
+                    return c;
-                    c.LastName.Equals(contact.LastName, StringComparison.OrdinalIgnoreCase) &&
-                    (!string.IsNullOrEmpty(c.FirstName) || !string.IsNullOrEmpty(c.LastName)));
-                if (byName != null) return byName;
             }
 
             return null;
         }
 
+        private static bool IsMatch(UnifiedContact a, UnifiedContact b)
+        {
+            // Mindestens ein identifizierendes Feld muss vorhanden sein
+            bool hasName = !string.IsNullOrEmpty(a.FirstName) || !string.IsNullOrEmpty(a.LastName);
+            bool hasEmail = !string.IsNullOrEmpty(a.Email);
+            bool hasPhone = !string.IsNullOrEmpty(a.PhoneWork) || !string.IsNullOrEmpty(a.PhoneMobile);
+
+            if (!hasName && !hasEmail && !hasPhone) return false;
+
+            // E-Mail: wenn auf beiden Seiten vorhanden, muss sie gleich sein
+            // Wenn nur auf einer Seite vorhanden -> kein Match
+            if (!FieldsCompatible(a.Email, b.Email)) return false;
+
+            // Name: wenn auf einer Seite vorhanden, muss er gleich sein
+            if (!FieldsCompatible(a.FirstName, b.FirstName)) return false;
+            if (!FieldsCompatible(a.LastName, b.LastName)) return false;
+
+            // Firma: wenn auf einer Seite vorhanden, muss sie gleich sein
+            // Leere Firma vs. gefuellte Firma = verschiedene Kontakte
+            if (!FieldsCompatible(a.Company, b.Company)) return false;
+
+            // Telefon/Fax: wenn auf einer Seite vorhanden, muss es gleich sein
+            if (!PhoneFieldsCompatible(a.PhoneWork, b.PhoneWork)) return false;
+            if (!PhoneFieldsCompatible(a.PhoneMobile, b.PhoneMobile)) return false;
+            if (!PhoneFieldsCompatible(a.PhoneHome, b.PhoneHome)) return false;
+            if (!PhoneFieldsCompatible(a.Fax, b.Fax)) return false;
+
+            // Mindestens ein starkes Match muss vorhanden sein
+            bool emailMatch = !string.IsNullOrEmpty(a.Email) && !string.IsNullOrEmpty(b.Email)
+                              && a.Email.Equals(b.Email, StringComparison.OrdinalIgnoreCase);
+            bool nameMatch = hasName
+                             && a.FirstName.Equals(b.FirstName, StringComparison.OrdinalIgnoreCase)
+                             && a.LastName.Equals(b.LastName, StringComparison.OrdinalIgnoreCase)
+                             && (!string.IsNullOrEmpty(a.FirstName) || !string.IsNullOrEmpty(a.LastName));
+            bool phoneMatch = (!string.IsNullOrEmpty(a.PhoneWork) && !string.IsNullOrEmpty(b.PhoneWork)
+                               && NormalizePhone(a.PhoneWork) == NormalizePhone(b.PhoneWork))
+                              || (!string.IsNullOrEmpty(a.Fax) && !string.IsNullOrEmpty(b.Fax)
+                               && NormalizePhone(a.Fax) == NormalizePhone(b.Fax));
+            bool companyMatch = !string.IsNullOrEmpty(a.Company) && !string.IsNullOrEmpty(b.Company)
+                                && a.Company.Equals(b.Company, StringComparison.OrdinalIgnoreCase);
+
+            // Email oder Name reicht. Telefon/Fax nur mit Firma zusammen.
+            return emailMatch || nameMatch || (phoneMatch && companyMatch) || (companyMatch && phoneMatch);
+        }
+
+        /// <summary>
+        /// Prueft ob zwei Felder kompatibel sind.
+        /// Beide leer = kompatibel. Beide gleich = kompatibel.
+        /// Eins leer, eins gefuellt = NICHT kompatibel (verschiedene Kontakte).
+        /// </summary>
+        private static bool FieldsCompatible(string a, string b)
+        {
+            bool aEmpty = string.IsNullOrEmpty(a);
+            bool bEmpty = string.IsNullOrEmpty(b);
+
+            if (aEmpty && bEmpty) return true;
+            if (aEmpty != bEmpty) return false; // Einer leer, anderer nicht
+            return a.Equals(b, StringComparison.OrdinalIgnoreCase);
+        }
+
+        private static bool PhoneFieldsCompatible(string a, string b)
+        {
+            bool aEmpty = string.IsNullOrEmpty(a);
+            bool bEmpty = string.IsNullOrEmpty(b);
+
+            if (aEmpty && bEmpty) return true;
+            if (aEmpty != bEmpty) return false;
+            return NormalizePhone(a) == NormalizePhone(b);
+        }
+
+        private static string NormalizePhone(string phone)
+        {
+            if (string.IsNullOrEmpty(phone)) return "";
+            // Nur Ziffern und + behalten
+            return new string(phone.Where(c => char.IsDigit(c) || c == '+').ToArray());
+        }
+
         public async Task<SyncResult> SyncProfileAsync(SyncProfile profile)
         {
             var result = new SyncResult
@@ -49,10 +122,10 @@ namespace StarfaceOutlookSync.Services
 
             try
             {
-                // Starface verbinden
                 Log("Verbinde mit Starface...");
                 using (var starface = new StarfaceApiClient(profile.StarfaceConnection))
                 {
+                    starface.OnDebug += (msg) => Log(msg);
                     var loginOk = await starface.LoginAsync();
                     if (!loginOk)
                     {
@@ -61,10 +134,6 @@ namespace StarfaceOutlookSync.Services
                         return result;
                     }
 
-                    var mappings = _profileManager.GetMappings(profile.Id);
-                    var mappingByOutlook = mappings.ToDictionary(m => m.OutlookEntryId, m => m);
-                    var mappingByStarface = mappings.ToDictionary(m => m.StarfaceId, m => m);
-
                     // Kontakte laden
                     Log("Lade Outlook-Kontakte...");
                     var outlookContacts = _outlookService.GetContacts(profile.OutlookFolderPath);
@@ -74,144 +143,290 @@ namespace StarfaceOutlookSync.Services
                     var starfaceContacts = await starface.GetContactsAsync(profile.StarfaceAddressBook);
                     Log($"{starfaceContacts.Count} Starface-Kontakte geladen");
 
-                    // Outlook -> Starface
+                    // Bestehende Mappings laden
-                    if (profile.SyncDirection == SyncDirection.Both ||
+                    var mappings = _profileManager.GetMappings(profile.Id);
-                        profile.SyncDirection == SyncDirection.OutlookToStarface)
-                    {
-                        Log("Synchronisiere Outlook -> Starface...");
-                        foreach (var oc in outlookContacts)
-                        {
-                            try
-                            {
-                                SyncMapping existing = null;
-                                if (!string.IsNullOrEmpty(oc.OutlookEntryId))
-                                    mappingByOutlook.TryGetValue(oc.OutlookEntryId, out existing);
 
-                                if (existing != null)
+                    // Sets fuer schnellen Lookup
+                    var mappingByOutlook = new Dictionary<string, SyncMapping>();
+                    var mappingByStarface = new Dictionary<string, SyncMapping>();
+                    foreach (var m in mappings)
+                    {
+                        if (!string.IsNullOrEmpty(m.OutlookEntryId))
+                            mappingByOutlook[m.OutlookEntryId] = m;
+                        if (!string.IsNullOrEmpty(m.StarfaceId))
+                            mappingByStarface[m.StarfaceId] = m;
+                    }
+
+                    // Tracking: welche Kontakte wurden bereits verarbeitet
+                    var processedStarfaceIds = new HashSet<string>();
+                    var processedOutlookIds = new HashSet<string>();
+                    var newMappings = new List<SyncMapping>();
+
+                    // ============================================
+                    // Phase 1: Bestehende Mappings abgleichen
+                    // ============================================
+                    Log("Gleiche bestehende Zuordnungen ab...");
+                    foreach (var mapping in mappings.ToList())
+                    {
+                        var oc = outlookContacts.FirstOrDefault(c => c.OutlookEntryId == mapping.OutlookEntryId);
+                        var sc = starfaceContacts.FirstOrDefault(c => c.StarfaceId == mapping.StarfaceId);
+
+                        if (oc != null) processedOutlookIds.Add(oc.OutlookEntryId);
+                        if (sc != null) processedStarfaceIds.Add(sc.StarfaceId);
+
+                        if (oc == null && sc == null)
+                        {
+                            // Beide Seiten geloescht -> Mapping entfernen
+                            Log($"  Mapping verwaist (beide geloescht), entferne");
+                            continue;
+                        }
+
+                        if (oc == null && sc != null)
+                        {
+                            // Outlook-Kontakt nicht gefunden.
+                            // Erst pruefen ob er vielleicht nur eine neue EntryID hat
+                            var reMatch = FindMatch(sc, outlookContacts.Where(c =>
+                                !processedOutlookIds.Contains(c.OutlookEntryId)).ToList());
+                            if (reMatch != null)
+                            {
+                                // Kontakt existiert noch in Outlook, nur EntryID geaendert
+                                Log($"  EntryID geaendert, verknuepfe neu: {sc.DisplayName}");
+                                mapping.OutlookEntryId = reMatch.OutlookEntryId;
+                                processedOutlookIds.Add(reMatch.OutlookEntryId);
+                                newMappings.Add(mapping);
+                                continue;
+                            }
+
+                            // Wirklich geloescht -> in Starface auch loeschen
+                            if (profile.SyncDirection == SyncDirection.Both || profile.SyncDirection == SyncDirection.OutlookToStarface)
+                            {
+                                if (await starface.DeleteContactAsync(mapping.StarfaceId))
                                 {
-                                    var hash = oc.GetHash();
+                                    result.Updated++;
-                                    if (hash != existing.LastSyncHash)
+                                    Log($"  Geloescht (OL->SF): {sc.DisplayName}");
+                                }
+                            }
+                            else
+                            {
+                                newMappings.Add(mapping);
+                            }
+                            continue;
+                        }
+
+                        if (oc != null && sc == null)
+                        {
+                            // Starface-Kontakt nicht gefunden.
+                            // Kann passieren wenn der Kontakt einem anderen Adressbuch gehoert.
+                            // NICHT loeschen, nur Mapping entfernen - wird in Phase 2/3 neu verknuepft
+                            Log($"  Starface-Kontakt nicht in Liste (anderes Adressbuch?): {oc.DisplayName}");
+                            // Mapping verwerfen, Outlook-Kontakt als unverarbeitet belassen
+                            // damit er in Phase 2 neu zugeordnet oder erstellt werden kann
+                            continue;
+                        }
+
+                        if (oc != null && sc != null)
+                        {
+                            // Beide vorhanden -> auf Aenderungen pruefen
+                            var olHash = oc.GetHash();
+                            var sfHash = sc.GetHash();
+                            bool olChanged = olHash != mapping.LastSyncHash;
+                            bool sfChanged = sfHash != mapping.LastSyncHash;
+
+                            if (olChanged && !sfChanged && (profile.SyncDirection == SyncDirection.Both || profile.SyncDirection == SyncDirection.OutlookToStarface))
+                            {
+                                // Outlook hat sich geaendert -> Starface updaten
+                                if (await starface.UpdateContactAsync(mapping.StarfaceId, oc, profile.StarfaceAddressBook))
+                                {
+                                    mapping.LastSyncHash = olHash;
+                                    result.Updated++;
+                                    Log($"  Aktualisiert (OL->SF): {oc.DisplayName}");
+                                }
+                            }
+                            else if (sfChanged && !olChanged && (profile.SyncDirection == SyncDirection.Both || profile.SyncDirection == SyncDirection.StarfaceToOutlook))
+                            {
+                                // Starface hat sich geaendert -> Outlook updaten
+                                if (_outlookService.UpdateContact(mapping.OutlookEntryId, sc))
+                                {
+                                    mapping.LastSyncHash = sfHash;
+                                    result.Updated++;
+                                    Log($"  Aktualisiert (SF->OL): {sc.DisplayName}");
+                                }
+                            }
+                            else if (olChanged && sfChanged)
+                            {
+                                // Beide geaendert -> Konflikt, neuere gewinnt (Outlook bevorzugt)
+                                if (profile.SyncDirection != SyncDirection.StarfaceToOutlook)
+                                {
+                                    if (await starface.UpdateContactAsync(mapping.StarfaceId, oc, profile.StarfaceAddressBook))
                                     {
-                                        if (await starface.UpdateContactAsync(existing.StarfaceId, oc, profile.StarfaceAddressBook))
+                                        mapping.LastSyncHash = olHash;
-                                        {
+                                        result.Updated++;
-                                            existing.LastSyncHash = hash;
+                                        Log($"  Konflikt (OL gewinnt): {oc.DisplayName}");
-                                            result.Updated++;
-                                        }
                                     }
                                 }
                                 else
                                 {
-                                    var match = FindMatch(oc, starfaceContacts);
+                                    if (_outlookService.UpdateContact(mapping.OutlookEntryId, sc))
-                                    if (match != null && !string.IsNullOrEmpty(match.StarfaceId))
                                     {
-                                        if (await starface.UpdateContactAsync(match.StarfaceId, oc, profile.StarfaceAddressBook))
+                                        mapping.LastSyncHash = sfHash;
+                                        result.Updated++;
+                                        Log($"  Konflikt (SF gewinnt): {sc.DisplayName}");
+                                    }
+                                }
+                            }
+                            // Beide unveraendert -> nichts tun
+                        }
+
+                        newMappings.Add(mapping);
+                    }
+
+                    // ============================================
+                    // Phase 2: Neue Outlook-Kontakte (ohne Mapping)
+                    // ============================================
+                    if (profile.SyncDirection == SyncDirection.Both || profile.SyncDirection == SyncDirection.OutlookToStarface)
+                    {
+                        var unmappedOutlook = outlookContacts
+                            .Where(c => !string.IsNullOrEmpty(c.OutlookEntryId) && !processedOutlookIds.Contains(c.OutlookEntryId))
+                            .ToList();
+
+                        if (unmappedOutlook.Count > 0)
+                            Log($"Neue Outlook-Kontakte: {unmappedOutlook.Count}");
+
+                        // Starface-Kontakte die noch kein Mapping haben (fuer Duplikat-Check)
+                        var unmappedStarface = starfaceContacts
+                            .Where(c => !string.IsNullOrEmpty(c.StarfaceId) && !processedStarfaceIds.Contains(c.StarfaceId))
+                            .ToList();
+
+                        foreach (var oc in unmappedOutlook)
+                        {
+                            try
+                            {
+                                // Duplikat-Check: existiert der Kontakt schon in der Starface?
+                                var match = FindMatch(oc, unmappedStarface);
+                                if (match != null)
+                                {
+                                    // Existiert schon -> verknuepfen und updaten
+                                    if (await starface.UpdateContactAsync(match.StarfaceId, oc, profile.StarfaceAddressBook))
+                                    {
+                                        newMappings.Add(new SyncMapping
                                         {
-                                            _profileManager.AddOrUpdateMapping(new SyncMapping
+                                            ProfileId = profile.Id,
-                                            {
+                                            OutlookEntryId = oc.OutlookEntryId,
-                                                ProfileId = profile.Id,
+                                            StarfaceId = match.StarfaceId,
-                                                OutlookEntryId = oc.OutlookEntryId,
+                                            LastSyncHash = oc.GetHash()
-                                                StarfaceId = match.StarfaceId,
+                                        });
-                                                LastSyncHash = oc.GetHash()
+                                        processedStarfaceIds.Add(match.StarfaceId);
-                                            });
+                                        unmappedStarface.Remove(match);
-                                            result.Updated++;
+                                        result.Updated++;
-                                        }
+                                        Log($"  Verknuepft (OL->SF): {oc.DisplayName}");
+                                    }
+                                }
+                                else
+                                {
+                                    // Neu -> in Starface erstellen
+                                    Log($"  Erstelle in Starface: {oc.DisplayName}");
+                                    var created = await starface.CreateContactAsync(oc, profile.StarfaceAddressBook);
+                                    if (created != null && !string.IsNullOrEmpty(created.StarfaceId))
+                                    {
+                                        newMappings.Add(new SyncMapping
+                                        {
+                                            ProfileId = profile.Id,
+                                            OutlookEntryId = oc.OutlookEntryId,
+                                            StarfaceId = created.StarfaceId,
+                                            LastSyncHash = oc.GetHash()
+                                        });
+                                        result.Created++;
+                                        Log($"  Erstellt (OL->SF): {oc.DisplayName}");
                                     }
                                     else
                                     {
-                                        var created = await starface.CreateContactAsync(oc, profile.StarfaceAddressBook);
+                                        Log($"  FEHLER: Kontakt konnte nicht erstellt werden: {oc.DisplayName}");
-                                        if (created != null && !string.IsNullOrEmpty(created.StarfaceId))
+                                        result.Errors++;
-                                        {
-                                            _profileManager.AddOrUpdateMapping(new SyncMapping
-                                            {
-                                                ProfileId = profile.Id,
-                                                OutlookEntryId = oc.OutlookEntryId,
-                                                StarfaceId = created.StarfaceId,
-                                                LastSyncHash = oc.GetHash()
-                                            });
-                                            result.Created++;
-                                        }
                                     }
                                 }
                             }
                             catch (Exception ex)
                             {
                                 result.Errors++;
-                                result.ErrorMessages.Add($"{oc.DisplayName}: {ex.Message}");
+                                result.ErrorMessages.Add($"OL->SF {oc.DisplayName}: {ex.Message}");
                             }
                         }
                     }
 
-                    // Starface -> Outlook
+                    // ============================================
-                    if (profile.SyncDirection == SyncDirection.Both ||
+                    // Phase 3: Neue Starface-Kontakte (ohne Mapping)
-                        profile.SyncDirection == SyncDirection.StarfaceToOutlook)
+                    // ============================================
+                    if (profile.SyncDirection == SyncDirection.Both || profile.SyncDirection == SyncDirection.StarfaceToOutlook)
                     {
-                        Log("Synchronisiere Starface -> Outlook...");
+                        var unmappedStarface = starfaceContacts
-                        foreach (var sc in starfaceContacts)
+                            .Where(c => !string.IsNullOrEmpty(c.StarfaceId) && !processedStarfaceIds.Contains(c.StarfaceId))
+                            .ToList();
+
+                        if (unmappedStarface.Count > 0)
+                            Log($"Neue Starface-Kontakte: {unmappedStarface.Count}");
+
+                        // Outlook-Kontakte die noch kein Mapping haben (fuer Duplikat-Check)
+                        var unmappedOutlook = outlookContacts
+                            .Where(c => !string.IsNullOrEmpty(c.OutlookEntryId) && !processedOutlookIds.Contains(c.OutlookEntryId))
+                            .ToList();
+
+                        foreach (var sc in unmappedStarface)
                         {
                             try
                             {
-                                SyncMapping existing = null;
+                                // Duplikat-Check: existiert der Kontakt schon in Outlook?
-                                if (!string.IsNullOrEmpty(sc.StarfaceId))
+                                var match = FindMatch(sc, unmappedOutlook);
-                                    mappingByStarface.TryGetValue(sc.StarfaceId, out existing);
+                                if (match != null)
-
-                                if (existing != null)
                                 {
-                                    var hash = sc.GetHash();
+                                    // Existiert schon -> verknuepfen und updaten
-                                    if (hash != existing.LastSyncHash)
+                                    if (_outlookService.UpdateContact(match.OutlookEntryId, sc))
                                     {
-                                        if (_outlookService.UpdateContact(existing.OutlookEntryId, sc))
+                                        newMappings.Add(new SyncMapping
                                         {
-                                            existing.LastSyncHash = hash;
+                                            ProfileId = profile.Id,
-                                            result.Updated++;
+                                            OutlookEntryId = match.OutlookEntryId,
-                                        }
+                                            StarfaceId = sc.StarfaceId,
+                                            LastSyncHash = sc.GetHash()
+                                        });
+                                        processedOutlookIds.Add(match.OutlookEntryId);
+                                        unmappedOutlook.Remove(match);
+                                        result.Updated++;
+                                        Log($"  Verknuepft (SF->OL): {sc.DisplayName}");
                                     }
                                 }
                                 else
                                 {
-                                    var match = FindMatch(sc, outlookContacts);
+                                    // Neu -> in Outlook erstellen
-                                    if (match != null && !string.IsNullOrEmpty(match.OutlookEntryId))
+                                    var created = _outlookService.CreateContact(sc, profile.OutlookFolderPath);
+                                    if (created != null && !string.IsNullOrEmpty(created.OutlookEntryId))
                                     {
-                                        if (_outlookService.UpdateContact(match.OutlookEntryId, sc))
+                                        newMappings.Add(new SyncMapping
                                         {
-                                            _profileManager.AddOrUpdateMapping(new SyncMapping
+                                            ProfileId = profile.Id,
-                                            {
+                                            OutlookEntryId = created.OutlookEntryId,
-                                                ProfileId = profile.Id,
+                                            StarfaceId = sc.StarfaceId,
-                                                OutlookEntryId = match.OutlookEntryId,
+                                            LastSyncHash = sc.GetHash()
-                                                StarfaceId = sc.StarfaceId,
+                                        });
-                                                LastSyncHash = sc.GetHash()
+                                        result.Created++;
-                                            });
+                                        Log($"  Erstellt (SF->OL): {sc.DisplayName}");
-                                            result.Updated++;
-                                        }
-                                    }
-                                    else
-                                    {
-                                        var created = _outlookService.CreateContact(sc, profile.OutlookFolderPath);
-                                        if (created != null && !string.IsNullOrEmpty(created.OutlookEntryId))
-                                        {
-                                            _profileManager.AddOrUpdateMapping(new SyncMapping
-                                            {
-                                                ProfileId = profile.Id,
-                                                OutlookEntryId = created.OutlookEntryId,
-                                                StarfaceId = sc.StarfaceId,
-                                                LastSyncHash = sc.GetHash()
-                                            });
-                                            result.Created++;
-                                        }
                                     }
                                 }
                             }
                             catch (Exception ex)
                             {
                                 result.Errors++;
-                                result.ErrorMessages.Add($"{sc.DisplayName}: {ex.Message}");
+                                result.ErrorMessages.Add($"SF->OL {sc.DisplayName}: {ex.Message}");
                             }
                         }
                     }
 
+                    // Mappings speichern
+                    _profileManager.SaveMappings(profile.Id, newMappings);
                     _profileManager.UpdateLastSync(profile.Id);
-                    _profileManager.SaveMappings(profile.Id, mappings);
+
                     await starface.LogoutAsync();
-                    Log("Synchronisation abgeschlossen!");
+
+                    Log($"Fertig: {result.Created} erstellt, {result.Updated} aktualisiert, {result.Errors} Fehler");
                 }
             }
             catch (Exception ex)

src/StarfaceOutlookSync/StarfaceOutlookSync.csproj

@@ -7,9 +7,9 @@
     <AssemblyTitle>Starface Outlook Sync</AssemblyTitle>
     <Company>HackerSoft - Hacker-Net Telekommunikation</Company>
     <Product>Starface Outlook Sync</Product>
-    <Version>0.0.0.2</Version>
+    <Version>0.0.0.23</Version>
-    <AssemblyVersion>0.0.0.2</AssemblyVersion>
+    <AssemblyVersion>0.0.0.23</AssemblyVersion>
-    <FileVersion>0.0.0.2</FileVersion>
+    <FileVersion>0.0.0.23</FileVersion>
     <Description>Synchronisiert Outlook-Kontakte mit Starface Telefonanlage</Description>
     <Copyright>Stefan Hacker - HackerSoft</Copyright>
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
@@ -19,7 +19,6 @@
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="Microsoft.Office.Interop.Outlook" Version="15.0.4797.1004" />
   </ItemGroup>
 
 </Project>

src/StarfaceOutlookSync/UI/AboutForm.cs

@@ -27,7 +27,7 @@ namespace StarfaceOutlookSync.UI
 
             var lblVersion = new Label
             {
-                Text = "Version 0.0.0.2",
+                Text = "Version 0.0.0.23",
                 Left = 0, Top = 56, Width = 340, Height = 20,
                 TextAlign = ContentAlignment.MiddleCenter,
                 ForeColor = Color.Gray

src/StarfaceOutlookSync/UI/AppIcon.cs

@@ -0,0 +1,108 @@
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+
+namespace StarfaceOutlookSync.UI
+{
+    /// <summary>
+    /// Generiert das App-Icon programmatisch (Kontakt-Symbol mit Sync-Pfeilen).
+    /// Kein externes ICO-File noetig.
+    /// </summary>
+    public static class AppIcon
+    {
+        private static Icon _icon;
+
+        public static Icon GetIcon()
+        {
+            if (_icon != null) return _icon;
+            _icon = CreateIcon(32);
+            return _icon;
+        }
+
+        public static Icon GetSmallIcon()
+        {
+            return CreateIcon(16);
+        }
+
+        private static Icon CreateIcon(int size)
+        {
+            using (var bmp = new Bitmap(size, size))
+            using (var g = Graphics.FromImage(bmp))
+            {
+                g.SmoothingMode = SmoothingMode.AntiAlias;
+                g.Clear(Color.Transparent);
+
+                if (size >= 32)
+                    DrawIcon32(g);
+                else
+                    DrawIcon16(g);
+
+                return Icon.FromHandle(bmp.GetHicon());
+            }
+        }
+
+        private static void DrawIcon32(Graphics g)
+        {
+            // Hintergrund: abgerundetes Quadrat
+            using (var bgBrush = new SolidBrush(Color.FromArgb(0, 120, 212)))
+            {
+                FillRoundedRect(g, bgBrush, 0, 0, 31, 31, 6);
+            }
+
+            // Person (Kopf)
+            using (var whiteBrush = new SolidBrush(Color.White))
+            {
+                g.FillEllipse(whiteBrush, 11, 4, 10, 10);
+                // Person (Koerper)
+                g.FillPie(whiteBrush, 6, 14, 20, 18, 180, 180);
+            }
+
+            // Sync-Pfeile unten rechts
+            using (var arrowPen = new Pen(Color.FromArgb(120, 255, 120), 2f))
+            {
+                arrowPen.StartCap = LineCap.Round;
+                arrowPen.EndCap = LineCap.ArrowAnchor;
+                // Pfeil rechts
+                g.DrawArc(arrowPen, 20, 22, 10, 8, 200, 140);
+                arrowPen.Color = Color.FromArgb(255, 200, 80);
+                // Pfeil links
+                g.DrawArc(arrowPen, 20, 22, 10, 8, 20, 140);
+            }
+        }
+
+        private static void DrawIcon16(Graphics g)
+        {
+            // Hintergrund
+            using (var bgBrush = new SolidBrush(Color.FromArgb(0, 120, 212)))
+            {
+                FillRoundedRect(g, bgBrush, 0, 0, 15, 15, 3);
+            }
+
+            // Person (vereinfacht)
+            using (var whiteBrush = new SolidBrush(Color.White))
+            {
+                g.FillEllipse(whiteBrush, 4, 1, 7, 7);
+                g.FillPie(whiteBrush, 2, 8, 12, 10, 180, 180);
+            }
+
+            // Kleiner Sync-Indikator
+            using (var dotBrush = new SolidBrush(Color.FromArgb(120, 255, 120)))
+            {
+                g.FillEllipse(dotBrush, 11, 11, 4, 4);
+            }
+        }
+
+        private static void FillRoundedRect(Graphics g, Brush brush, int x, int y, int w, int h, int r)
+        {
+            using (var path = new GraphicsPath())
+            {
+                path.AddArc(x, y, r * 2, r * 2, 180, 90);
+                path.AddArc(x + w - r * 2, y, r * 2, r * 2, 270, 90);
+                path.AddArc(x + w - r * 2, y + h - r * 2, r * 2, r * 2, 0, 90);
+                path.AddArc(x, y + h - r * 2, r * 2, r * 2, 90, 90);
+                path.CloseFigure();
+                g.FillPath(brush, path);
+            }
+        }
+    }
+}

src/StarfaceOutlookSync/UI/MainForm.cs

@@ -18,10 +18,11 @@ namespace StarfaceOutlookSync.UI
         private NotifyIcon _trayIcon;
         private ContextMenuStrip _trayMenu;
         private ListView _profileList;
-        private Button _btnNew, _btnEdit, _btnDelete, _btnSync, _btnInfo;
+        private Button _btnNew, _btnEdit, _btnDelete, _btnSync, _btnReset, _btnSettings, _btnInfo;
         private StatusStrip _statusBar;
         private ToolStripStatusLabel _statusLabel;
         private Timer _autoSyncTimer;
+        private volatile bool _syncRunning = false;
 
         public MainForm()
         {
@@ -29,15 +30,57 @@ namespace StarfaceOutlookSync.UI
             SetupTrayIcon();
             SetupAutoSync();
             RefreshProfileList();
+
+            // Einstellungen laden und anwenden
+            var settings = UserSettings.Load();
+            settings.ApplyOutlookSecuritySetting();
+
+            if (settings.StartMinimized)
+            {
+                WindowState = FormWindowState.Minimized;
+                ShowInTaskbar = false;
+                Visible = false;
+            }
+
+            // Beim Start automatisch synchronisieren
+            if (settings.SyncOnStart)
+            {
+                _ = SyncAllProfiles();
+            }
+        }
+
+        private async Task SyncAllProfiles()
+        {
+            var profiles = _profileManager.GetProfiles().Where(p => p.Enabled).ToList();
+            foreach (var profile in profiles)
+            {
+                await RunSync(profile);
+            }
+        }
+
+        protected override void SetVisibleCore(bool value)
+        {
+            // Beim ersten Anzeigen pruefen ob minimiert gestartet werden soll
+            if (!IsHandleCreated)
+            {
+                var settings = UserSettings.Load();
+                if (settings.StartMinimized)
+                {
+                    CreateHandle();
+                    value = false;
+                }
+            }
+            base.SetVisibleCore(value);
         }
 
         private void InitializeComponent()
         {
             Text = "Starface Kontakt-Sync";
-            Size = new Size(620, 450);
+            Size = new Size(830, 450);
-            MinimumSize = new Size(500, 350);
+            MinimumSize = new Size(830, 350);
             StartPosition = FormStartPosition.CenterScreen;
             Font = new Font("Segoe UI", 9);
+            Icon = AppIcon.GetIcon();
 
             // Profil-Liste
             _profileList = new ListView
@@ -73,13 +116,19 @@ namespace StarfaceOutlookSync.UI
             _btnDelete = new Button { Text = "Loeschen", Width = 80, Height = 30 };
             _btnDelete.Click += (s, e) => DeleteProfile();
 
-            _btnSync = new Button { Text = "Jetzt synchronisieren", Width = 150, Height = 30 };
+            _btnSync = new Button { Text = "Synchronisieren", Width = 110, Height = 30 };
             _btnSync.Click += async (s, e) => await SyncSelectedProfile();
 
+            _btnReset = new Button { Text = "Sync Reset", Width = 80, Height = 30 };
+            _btnReset.Click += (s, e) => ResetSync();
+
+            _btnSettings = new Button { Text = "Einstellungen", Width = 95, Height = 30 };
+            _btnSettings.Click += (s, e) => ShowSettings();
+
             _btnInfo = new Button { Text = "Info", Width = 50, Height = 30 };
             _btnInfo.Click += (s, e) => ShowAbout();
 
-            buttonPanel.Controls.AddRange(new Control[] { _btnNew, _btnEdit, _btnDelete, _btnSync, _btnInfo });
+            buttonPanel.Controls.AddRange(new Control[] { _btnNew, _btnEdit, _btnDelete, _btnSync, _btnReset, _btnSettings, _btnInfo });
 
             // Statusbar
             _statusBar = new StatusStrip();
@@ -94,10 +143,26 @@ namespace StarfaceOutlookSync.UI
         private void SetupTrayIcon()
         {
             _trayMenu = new ContextMenuStrip();
+
+            _trayIcon = new NotifyIcon
+            {
+                Text = "Starface Kontakt-Sync",
+                Icon = AppIcon.GetSmallIcon(),
+                ContextMenuStrip = _trayMenu,
+                Visible = true
+            };
+
+            _trayIcon.DoubleClick += (s, e) => ShowMainWindow();
+
+            UpdateTrayMenu();
+        }
+
+        private void UpdateTrayMenu()
+        {
+            _trayMenu.Items.Clear();
             _trayMenu.Items.Add("Oeffnen", null, (s, e) => ShowMainWindow());
             _trayMenu.Items.Add("-");
 
-            // Schnell-Sync fuer jedes Profil
             var profiles = _profileManager.GetProfiles();
             foreach (var p in profiles.Where(p => p.Enabled))
             {
@@ -111,17 +176,8 @@ namespace StarfaceOutlookSync.UI
             if (profiles.Any(p => p.Enabled))
                 _trayMenu.Items.Add("-");
 
+            _trayMenu.Items.Add("Ueber", null, (s, e) => ShowAbout());
             _trayMenu.Items.Add("Beenden", null, (s, e) => ExitApplication());
-
-            _trayIcon = new NotifyIcon
-            {
-                Text = "Starface Kontakt-Sync",
-                Icon = SystemIcons.Application, // Placeholder, wird durch eigenes Icon ersetzt
-                ContextMenuStrip = _trayMenu,
-                Visible = true
-            };
-
-            _trayIcon.DoubleClick += (s, e) => ShowMainWindow();
         }
 
         private void SetupAutoSync()
@@ -189,7 +245,7 @@ namespace StarfaceOutlookSync.UI
             }
 
             // Tray-Menu aktualisieren
-            SetupTrayIcon();
+            UpdateTrayMenu();
         }
 
         private void NewProfile()
@@ -228,6 +284,36 @@ namespace StarfaceOutlookSync.UI
             }
         }
 
+        private void ResetSync()
+        {
+            if (_profileList.SelectedItems.Count == 0)
+            {
+                MessageBox.Show("Bitte ein Profil auswaehlen.", "Sync Reset",
+                    MessageBoxButtons.OK, MessageBoxIcon.Information);
+                return;
+            }
+
+            var profile = _profileList.SelectedItems[0].Tag as SyncProfile;
+            if (profile == null) return;
+
+            var msg = $"Sync-Zuordnungen fuer '{profile.Name}' zuruecksetzen?\n\n" +
+                      "Alle Kontakt-Verknuepfungen werden geloescht.\n" +
+                      "Beim naechsten Sync werden die Kontakte neu abgeglichen.\n" +
+                      "Es werden keine Kontakte geloescht.";
+
+            if (MessageBox.Show(msg, "Sync Reset",
+                MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
+            {
+                _profileManager.SaveMappings(profile.Id, new List<SyncMapping>());
+                // LastSync auch zuruecksetzen
+                profile.LastSync = "";
+                _profileManager.UpdateProfile(profile);
+                RefreshProfileList();
+                MessageBox.Show("Sync-Zuordnungen wurden zurueckgesetzt.",
+                    "Sync Reset", MessageBoxButtons.OK, MessageBoxIcon.Information);
+            }
+        }
+
         private Task SyncSelectedProfile()
         {
             if (_profileList.SelectedItems.Count == 0)
@@ -251,6 +337,13 @@ namespace StarfaceOutlookSync.UI
 
         private async Task RunSync(SyncProfile profile)
         {
+            if (_syncRunning)
+            {
+                SetStatus("Sync laeuft bereits, bitte warten...");
+                return;
+            }
+
+            _syncRunning = true;
             try
             {
                 SetStatus($"Synchronisiere '{profile.Name}'...");
@@ -273,6 +366,10 @@ namespace StarfaceOutlookSync.UI
                     ex.Message, ToolTipIcon.Error);
                 SetStatus($"Fehler: {ex.Message}");
             }
+            finally
+            {
+                _syncRunning = false;
+            }
         }
 
         private void SetStatus(string text)
@@ -283,6 +380,14 @@ namespace StarfaceOutlookSync.UI
                 _statusLabel.Text = text;
         }
 
+        private void ShowSettings()
+        {
+            using (var settings = new SettingsForm())
+            {
+                settings.ShowDialog(this);
+            }
+        }
+
         private void ShowAbout()
         {
             using (var about = new AboutForm())

src/StarfaceOutlookSync/UI/OutlookFolderBrowserForm.cs

@@ -0,0 +1,125 @@
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+using System.Collections.Generic;
+
+namespace StarfaceOutlookSync.UI
+{
+    public class OutlookFolderBrowserForm : Form
+    {
+        private TreeView _tree;
+        private Button _btnOk, _btnCancel;
+        public string SelectedFolderPath { get; private set; } = "";
+        public string SelectedFolderName { get; private set; } = "";
+
+        public OutlookFolderBrowserForm(List<string> folderPaths, string currentSelection)
+        {
+            InitializeComponent();
+            BuildTree(folderPaths, currentSelection);
+        }
+
+        private void InitializeComponent()
+        {
+            Text = "Outlook-Ordner waehlen";
+            Size = new Size(400, 450);
+            FormBorderStyle = FormBorderStyle.FixedDialog;
+            MaximizeBox = false;
+            MinimizeBox = false;
+            StartPosition = FormStartPosition.CenterParent;
+            Font = new Font("Segoe UI", 9);
+
+            var lblInfo = new Label
+            {
+                Text = "Bitte waehlen Sie den Outlook-Kontaktordner fuer die Synchronisation:",
+                Left = 12, Top = 12, Width = 360, Height = 36
+            };
+
+            _tree = new TreeView
+            {
+                Left = 12, Top = 52, Width = 360, Height = 310,
+                HideSelection = false,
+                ShowLines = true,
+                ShowPlusMinus = true,
+                ShowRootLines = true
+            };
+            _tree.DoubleClick += (s, e) => { if (_tree.SelectedNode?.Tag != null) SelectAndClose(); };
+
+            _btnOk = new Button
+            {
+                Text = "OK", Left = 210, Top = 372, Width = 75, Height = 28,
+                DialogResult = DialogResult.None
+            };
+            _btnOk.Click += (s, e) => SelectAndClose();
+
+            _btnCancel = new Button
+            {
+                Text = "Abbrechen", Left = 292, Top = 372, Width = 80, Height = 28,
+                DialogResult = DialogResult.Cancel
+            };
+
+            Controls.AddRange(new Control[] { lblInfo, _tree, _btnOk, _btnCancel });
+            AcceptButton = _btnOk;
+            CancelButton = _btnCancel;
+        }
+
+        private void BuildTree(List<string> folderPaths, string currentSelection)
+        {
+            _tree.Nodes.Clear();
+            var nodeMap = new Dictionary<string, TreeNode>();
+
+            foreach (var path in folderPaths)
+            {
+                // Pfad: \\Store\Kontakte\Unterordner
+                var parts = path.TrimStart('\\').Split('\\');
+                string runningPath = "";
+                TreeNode parent = null;
+
+                for (int i = 0; i < parts.Length; i++)
+                {
+                    runningPath += "\\" + parts[i];
+
+                    if (!nodeMap.ContainsKey(runningPath))
+                    {
+                        var node = new TreeNode(parts[i]);
+                        // Nur Blatt-Knoten oder bekannte Pfade sind waehlbar
+                        if (i == parts.Length - 1)
+                            node.Tag = path; // Vollstaendiger Pfad
+
+                        if (parent == null)
+                            _tree.Nodes.Add(node);
+                        else
+                            parent.Nodes.Add(node);
+
+                        nodeMap[runningPath] = node;
+
+                        // Aktuellen Ordner vorauswaehlen
+                        if (path == currentSelection)
+                        {
+                            _tree.SelectedNode = node;
+                            node.EnsureVisible();
+                        }
+                    }
+
+                    parent = nodeMap[runningPath];
+                }
+            }
+
+            _tree.ExpandAll();
+        }
+
+        private void SelectAndClose()
+        {
+            if (_tree.SelectedNode?.Tag == null)
+            {
+                MessageBox.Show("Bitte einen Kontaktordner waehlen.", "Hinweis",
+                    MessageBoxButtons.OK, MessageBoxIcon.Information);
+                return;
+            }
+
+            SelectedFolderPath = _tree.SelectedNode.Tag.ToString();
+            SelectedFolderName = _tree.SelectedNode.Text;
+            DialogResult = DialogResult.OK;
+            Close();
+        }
+    }
+}

src/StarfaceOutlookSync/UI/ProfileEditorForm.cs

@@ -15,14 +15,18 @@ namespace StarfaceOutlookSync.UI
         private readonly bool _isNew;
 
         // Controls
-        private TextBox _txtName, _txtHost, _txtPort, _txtLoginId, _txtPassword;
+        private TextBox _txtName, _txtHost, _txtPort, _txtLoginId, _txtPassword, _txtOutlookFolder;
         private CheckBox _chkSsl, _chkEnabled;
-        private ComboBox _cmbAddressBook, _cmbOutlookFolder, _cmbDirection;
+        private ComboBox _cmbAddressBook, _cmbDirection;
+        private Button _btnBrowseFolder;
         private NumericUpDown _numAutoSync;
         private Button _btnTest, _btnLoadBooks, _btnSave, _btnCancel;
         private Label _lblTestResult;
 
         private List<StarfaceAddressBook> _addressBooks = new List<StarfaceAddressBook>();
+        private List<string> _outlookFolderPaths = new List<string>();
+        private string _selectedOutlookPath = "";
+        private string _selectedOutlookName = "";
 
         public ProfileEditorForm(SyncProfile profile)
         {
@@ -87,8 +91,11 @@ namespace StarfaceOutlookSync.UI
             panel.Controls.Add(MakeSectionLabel("Outlook-Einstellungen", 12, y)); y += 26;
 
             panel.Controls.Add(MakeLabel("Kontakte-Ordner:", 12, y)); y += 22;
-            _cmbOutlookFolder = new ComboBox { Left = 12, Top = y, Width = 420, DropDownStyle = ComboBoxStyle.DropDownList };
+            _txtOutlookFolder = new TextBox { Left = 12, Top = y, Width = 330, ReadOnly = true, BackColor = SystemColors.Window };
-            panel.Controls.Add(_cmbOutlookFolder); y += 32;
+            _btnBrowseFolder = new Button { Text = "Durchsuchen...", Left = 348, Top = y - 1, Width = 84, Height = 24 };
+            _btnBrowseFolder.Click += (s, e) => BrowseOutlookFolder();
+            panel.Controls.Add(_txtOutlookFolder);
+            panel.Controls.Add(_btnBrowseFolder); y += 32;
 
             panel.Controls.Add(MakeLabel("Sync-Richtung:", 12, y)); y += 22;
             _cmbDirection = new ComboBox { Left = 12, Top = y, Width = 250, DropDownStyle = ComboBoxStyle.DropDownList };
@@ -132,18 +139,15 @@ namespace StarfaceOutlookSync.UI
             {
                 using (var outlook = new OutlookContactsService())
                 {
-                    var folders = outlook.GetContactFolderPaths();
+                    _outlookFolderPaths = outlook.GetContactFolderPaths();
-                    _cmbOutlookFolder.Items.Clear();
-                    foreach (var f in folders)
-                        _cmbOutlookFolder.Items.Add(f);
-                    if (folders.Count > 0)
-                        _cmbOutlookFolder.SelectedIndex = 0;
                 }
             }
-            catch
+            catch (Exception ex)
             {
-                _cmbOutlookFolder.Items.Add("\\\\Kontakte");
+                MessageBox.Show(
-                _cmbOutlookFolder.SelectedIndex = 0;
+                    $"Outlook-Kontaktordner konnten nicht geladen werden:\n{ex.Message}\n\nIst Outlook gestartet?",
+                    "Outlook-Verbindung", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                _outlookFolderPaths = new List<string>();
             }
 
             // Bestehende Werte laden
@@ -160,15 +164,10 @@ namespace StarfaceOutlookSync.UI
 
                 _cmbDirection.SelectedIndex = (int)_existingProfile.SyncDirection;
 
-                // Outlook-Ordner auswaehlen
+                // Outlook-Ordner
-                for (int i = 0; i < _cmbOutlookFolder.Items.Count; i++)
+                _selectedOutlookPath = _existingProfile.OutlookFolderPath;
-                {
+                _selectedOutlookName = _existingProfile.OutlookFolderName;
-                    if (_cmbOutlookFolder.Items[i].ToString() == _existingProfile.OutlookFolderPath)
+                _txtOutlookFolder.Text = _selectedOutlookPath;
-                    {
-                        _cmbOutlookFolder.SelectedIndex = i;
-                        break;
-                    }
-                }
 
                 // Adressbuch
                 if (_existingProfile.StarfaceAddressBook != null)
@@ -178,6 +177,26 @@ namespace StarfaceOutlookSync.UI
                     _cmbAddressBook.SelectedIndex = 0;
                 }
             }
+            else if (_outlookFolderPaths.Count > 0)
+            {
+                // Standard-Ordner vorauswaehlen
+                _selectedOutlookPath = _outlookFolderPaths[0];
+                _selectedOutlookName = _selectedOutlookPath.Substring(_selectedOutlookPath.LastIndexOf('\\') + 1);
+                _txtOutlookFolder.Text = _selectedOutlookPath;
+            }
+        }
+
+        private void BrowseOutlookFolder()
+        {
+            using (var browser = new OutlookFolderBrowserForm(_outlookFolderPaths, _selectedOutlookPath))
+            {
+                if (browser.ShowDialog(this) == DialogResult.OK)
+                {
+                    _selectedOutlookPath = browser.SelectedFolderPath;
+                    _selectedOutlookName = browser.SelectedFolderName;
+                    _txtOutlookFolder.Text = _selectedOutlookPath;
+                }
+            }
         }
 
         private StarfaceConnection GetConnection()
@@ -292,10 +311,12 @@ namespace StarfaceOutlookSync.UI
                 return;
             }
 
-            var selectedFolder = _cmbOutlookFolder.SelectedItem?.ToString() ?? "";
+            if (string.IsNullOrEmpty(_selectedOutlookPath))
-            var folderName = selectedFolder;
+            {
-            if (folderName.Contains("\\"))
+                MessageBox.Show("Bitte einen Outlook-Kontaktordner waehlen.",
-                folderName = folderName.Substring(folderName.LastIndexOf('\\') + 1);
+                    "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return;
+            }
 
             var profile = new SyncProfile
             {
@@ -303,8 +324,8 @@ namespace StarfaceOutlookSync.UI
                 Name = _txtName.Text.Trim(),
                 StarfaceConnection = GetConnection(),
                 StarfaceAddressBook = _addressBooks[_cmbAddressBook.SelectedIndex],
-                OutlookFolderPath = selectedFolder,
+                OutlookFolderPath = _selectedOutlookPath,
-                OutlookFolderName = folderName,
+                OutlookFolderName = _selectedOutlookName,
                 SyncDirection = (SyncDirection)_cmbDirection.SelectedIndex,
                 Enabled = _chkEnabled.Checked,
                 AutoSyncIntervalMinutes = (int)_numAutoSync.Value,
@@ -312,9 +333,23 @@ namespace StarfaceOutlookSync.UI
             };
 
             if (_isNew)
+            {
                 _pm.AddProfile(profile);
+            }
             else
+            {
+                // Wenn Adressbuch gewechselt wurde, Mappings zuruecksetzen
+                if (_existingProfile.StarfaceAddressBook?.TagId != profile.StarfaceAddressBook?.TagId
+                    || _existingProfile.StarfaceAddressBook?.Type != profile.StarfaceAddressBook?.Type)
+                {
+                    _pm.SaveMappings(profile.Id, new List<SyncMapping>());
+                    profile.LastSync = "";
+                    MessageBox.Show(
+                        "Adressbuch wurde geaendert.\nSync-Zuordnungen wurden automatisch zurueckgesetzt.",
+                        "Adressbuch geaendert", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                }
                 _pm.UpdateProfile(profile);
+            }
 
             DialogResult = DialogResult.OK;
             Close();

src/StarfaceOutlookSync/UI/SettingsForm.cs

@@ -0,0 +1,91 @@
+using System.Drawing;
+using System.Windows.Forms;
+using StarfaceOutlookSync.Models;
+
+namespace StarfaceOutlookSync.UI
+{
+    public class SettingsForm : Form
+    {
+        private CheckBox _chkStartMinimized, _chkSyncOnStart, _chkAutoAcceptOutlook;
+        private Button _btnSave, _btnCancel;
+        private readonly UserSettings _settings;
+
+        public SettingsForm()
+        {
+            _settings = UserSettings.Load();
+            InitializeComponent();
+        }
+
+        private void InitializeComponent()
+        {
+            Text = "Einstellungen";
+            Size = new Size(380, 250);
+            FormBorderStyle = FormBorderStyle.FixedDialog;
+            MaximizeBox = false;
+            MinimizeBox = false;
+            StartPosition = FormStartPosition.CenterParent;
+            Font = new Font("Segoe UI", 9);
+
+            _chkStartMinimized = new CheckBox
+            {
+                Text = "Minimiert starten (nur im System Tray)",
+                Left = 20, Top = 24, AutoSize = true,
+                Checked = _settings.StartMinimized
+            };
+
+            _chkSyncOnStart = new CheckBox
+            {
+                Text = "Beim Start automatisch synchronisieren",
+                Left = 20, Top = 52, AutoSize = true,
+                Checked = _settings.SyncOnStart
+            };
+
+            _chkAutoAcceptOutlook = new CheckBox
+            {
+                Text = "Outlook-Sicherheitsabfrage automatisch erlauben",
+                Left = 20, Top = 80, AutoSize = true,
+                Checked = _settings.AutoAcceptOutlookPrompt
+            };
+
+            var hintText = "Hinweis: Outlook muss nach Aenderung neu gestartet werden.";
+            if (UserSettings.IsOutlookSecurityLockedByPolicy())
+                hintText += "\nAuf Domaenen-PCs: App einmalig als Admin starten!";
+
+            var lblHint = new Label
+            {
+                Text = hintText,
+                Left = 38, Top = 102, Width = 310, Height = 36,
+                ForeColor = UserSettings.IsOutlookSecurityLockedByPolicy() ? Color.OrangeRed : Color.Gray,
+                Font = new Font("Segoe UI", 8)
+            };
+
+            _btnSave = new Button
+            {
+                Text = "Speichern", Left = 95, Top = 170, Width = 85, Height = 28,
+                DialogResult = DialogResult.None
+            };
+            _btnSave.Click += (s, e) => Save();
+
+            _btnCancel = new Button
+            {
+                Text = "Abbrechen", Left = 189, Top = 170, Width = 85, Height = 28,
+                DialogResult = DialogResult.Cancel
+            };
+
+            Size = new Size(380, 260);
+            Controls.AddRange(new Control[] { _chkStartMinimized, _chkSyncOnStart, _chkAutoAcceptOutlook, lblHint, _btnSave, _btnCancel });
+            AcceptButton = _btnSave;
+            CancelButton = _btnCancel;
+        }
+
+        private void Save()
+        {
+            _settings.StartMinimized = _chkStartMinimized.Checked;
+            _settings.SyncOnStart = _chkSyncOnStart.Checked;
+            _settings.AutoAcceptOutlookPrompt = _chkAutoAcceptOutlook.Checked;
+            _settings.Save();
+            DialogResult = DialogResult.OK;
+            Close();
+        }
+    }
+}

src/StarfaceOutlookSync/UI/SyncProgressForm.cs

@@ -41,7 +41,8 @@ namespace StarfaceOutlookSync.UI
             _progressBar = new ProgressBar
             {
                 Left = 12, Top = 38, Width = 460, Height = 22,
-                Style = ProgressBarStyle.Marquee
+                Style = ProgressBarStyle.Blocks,
+                Value = 0
             };
 
             _txtLog = new TextBox