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Asked: 2026-05-31T00:34:41+00:00

I’m building an Outlook add-in in Visual Studio 2010, using VSTO with VB.net, to

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I’m building an Outlook add-in in Visual Studio 2010, using VSTO with VB.net, to sync Outlook Calendar data with an internal, proprietary Calendar. Our users want to be able to open a recurring appointment in Outlook, send the Appointment details and have the internal calendar update with the recurring appointment details.

I actually have code in place that works just fine for creating recurring appointments and single appointments. The problem is that I can see no difference (when viewing the AppointmentItem or RecurrenceItem members) between a single occurrence of the series being opened, or if the entire series has been opened; all the data is the same, all the functions have the same result. I can see there’s the difference in menu bars, but I don’t even see a way to detect that difference.

Has anybody run into this, and if so, how did you work around it?

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1 Answer

  1. Editorial Team

    You can use RecurrenceState property of AppointmentItem.

    If appointment is open as single occurence, it is equal to olApptOccurrence.
    If it is open as series – RecurrenceState is equal to olApptMaster.

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