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You use Microsoft Entourage to access a calendar on a computer that is running Microsoft Exchange Server 2007. After you schedule a recurring meeting, and then you modify some instances of this recurring meeting, some unexpected modified instances may appear in Entourage.
In specific scenarios, Exchange Server 2007 returns an iCal representation of the meeting series that includes some extra instances.
To resolve this problem, install Update Rollup 7 for Exchange Server 2007 Service Pack 1. For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: