Fix Outlook add-in registration: use Exchange or manual sideload

The TrustedCatalogs registry approach only works for Word/Excel/
PowerPoint, NOT for Outlook. Outlook add-ins must be registered
via Exchange or manually through OWA.

Setup now offers two paths:
- Exchange Online PowerShell (New-App) for organizations
- Manual sideload via https://aka.ms/olksideload as fallback

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

installer/uninstall.ps1

@@ -99,35 +99,25 @@ if (Test-Path $certInfoPath) {
 # Schritt 3: Outlook Add-in Registrierung entfernen
 # ============================================================
 
-Write-Header "Schritt 3: Outlook-Registrierung entfernen"
+Write-Header "Schritt 3: Outlook Add-in Registrierung"
 
-$outlookVersions = @("16.0", "15.0")
-foreach ($ver in $outlookVersions) {
-    # HKCU (Einzelplatz / aktueller User)
-    $catalogBasePath = "HKCU:\Software\Microsoft\Office\$ver\WEF\TrustedCatalogs"
-    if (Test-Path $catalogBasePath) {
-        $catalogs = Get-ChildItem $catalogBasePath -ErrorAction SilentlyContinue
-        foreach ($catalog in $catalogs) {
-            $url = Get-ItemProperty -Path $catalog.PSPath -Name "Url" -ErrorAction SilentlyContinue
-            if ($url -and $url.Url -like "*StarfaceOutlookSync*") {
-                Remove-Item $catalog.PSPath -Recurse -Force
-                Write-Step "Outlook $ver Katalog-Registrierung entfernt (HKCU)."
-            }
-        }
-    }
+# Pruefen ob per Exchange registriert
+$installInfoPath = Join-Path $InstallDir "install-info.json"
+$registeredViaExchange = $false
+if (Test-Path $installInfoPath) {
+    $installInfo = Get-Content $installInfoPath -Raw | ConvertFrom-Json
+    $registeredViaExchange = $installInfo.registeredViaExchange -eq $true
+}
 
-    # HKLM (Terminal Server / alle User)
-    $catalogBasePathLM = "HKLM:\Software\Microsoft\Office\$ver\WEF\TrustedCatalogs"
-    if (Test-Path $catalogBasePathLM) {
-        $catalogs = Get-ChildItem $catalogBasePathLM -ErrorAction SilentlyContinue
-        foreach ($catalog in $catalogs) {
-            $url = Get-ItemProperty -Path $catalog.PSPath -Name "Url" -ErrorAction SilentlyContinue
-            if ($url -and $url.Url -like "*StarfaceOutlookSync*") {
-                Remove-Item $catalog.PSPath -Recurse -Force
-                Write-Step "Outlook $ver Katalog-Registrierung entfernt (HKLM)."
-            }
-        }
-    }
+if ($registeredViaExchange) {
+    Write-Warn "Das Add-in wurde per Exchange bereitgestellt."
+    Write-Host "  Um es dort zu entfernen:" -ForegroundColor Gray
+    Write-Host "    1. Exchange Online PowerShell: Get-App | Remove-App" -ForegroundColor Gray
+    Write-Host "    2. Oder im Microsoft 365 Admin Center" -ForegroundColor Gray
+} else {
+    Write-Step "Das Add-in wurde manuell in Outlook hinzugefuegt."
+    Write-Host "  Bitte manuell entfernen:" -ForegroundColor Gray
+    Write-Host "    Outlook -> Add-Ins verwalten -> Add-In entfernen" -ForegroundColor Gray
 }
 
 # ============================================================