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- Try GetActiveObject first, then Activator.CreateInstance as fallback - Use Type.GetTypeFromProgID for version-independent COM activation - Clear error message explaining possible causes including New Outlook - NuGet Interop v15 is fine - it's the assembly version, works with all Outlook versions (2013-2024) via COM interface compatibility Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>