AppointmentItem.GlobalAppointmentID Property (Outlook)

Office 2013 and later

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Returns a String value that represents a unique global identifier for the AppointmentItem object. Read-only.

expression .GlobalAppointmentID

expression An expression that returns an AppointmentItem object.

There are situations where the entry ID of AppointmentItem objects may change, such as when an item is moved to a different folder or to a different store. Entry IDs can also change when a user performs certain functions in Outlook, such as exporting and then reimporting data.

Therefore, each Outlook appointment item is assigned a Global Object ID, a unique global identifier which does not change during those situations. The Global Object ID is a MAPI property that Outlook uses to correlate meeting updates and responses with a particular meeting on the calendar. The Global Object ID is the same across all copies of the item.