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Consider the following scenario. A client application uses Microsoft Exchange Server 2003 as a calendar resource. The client application uses Global Object IDs as the unique property to identify meeting requests. However, duplicate Global Object IDs may appear in Exchange 2003. The duplicate Global Object IDs may cause incorrect behavior when users use their calendars in the client application.
Note The Global Object ID is a MAPI property that Microsoft Office Outlook uses to match meeting updates and meeting responses to a particular meeting on the calendar.
This behavior is by design.
For more information about Global Object IDs, click the following article number to view the article in the Microsoft Knowledge Base:
899919 Developer information about the calendar changes in Outlook 2003 Service Pack 2, in Exchange Server 2003 Service Pack 2, and in later versions of Exchange Server and of Outlook