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Editorial Team
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Asked: 2026-05-12T14:48:52+00:00

I’m working on a VSTO Outlook 2007 add-in that basically synchronizes Outlook data with

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I’m working on a VSTO Outlook 2007 add-in that basically synchronizes Outlook data with web service. There are three types of synchronization that I want to have in the app: startup sync, manual sync and sync on shutdown. The first two as simple and are already done.

However I have problems finding an appropriate event to fire to handle my sync on shutdown. I tried hooking to the following two events but it seems that they are fired too late when add-in doesn’t have access to Outlook data and this just doesn’t work:

  • ((Outlook.ApplicationEvents_Event)Application).Quit (this one fires first, but it’s already too late to access Outlook data collections and update them)
  • ThisAddIn.Shutdown (this one fires after Quit so it’s not good as well)

Are there any other events that are fired before those ones on Outlook shutdown that I could use? Or maybe someone knows any other way to handle sync-on-shutdown in Outlook add-in?

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1 Answer

  1. Editorial Team

    Explorer.Close() and Inspector.Close() fire before Application.Quit() – in them you can check:

    • In Explorer.Close(): Application.Explorers.Count<=1 and Application.Inspectors.Count==0
    • In Inspector.Close(): Application.Explorers.Count==0 and Application.Inspectors.Count<=1

    If so, Outlook will close and you can fire your events. Just keep in mind that Outlook can be started window-less too (automation etc.) if thats an issue for you.

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