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When multiple users edit and save the same Public Folder (PF) message at the same time, a conflict notification message is delivered to the PF owner's inbox for conflict handling. However, in this situation, the Open Message In Conflict button is not available on the conflict notification message in the Inbox item for Exchange Server 2007 users.
To resolve this problem, download Update Rollup 4 for Exchange Server 2007 Service Pack 1. For more information about Update Rollup 4 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: