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In a Microsoft Exchange Server 2007 environment, the last logon time is not updated to reflect the logon times that have occurred after users log on to their mailboxes by using the Entourage client. However, the logon times are tracked if users use a Microsoft Outlook client to log on to their mailboxes.
Note Exchange Server 2003 correctly tracks both the Entourage client and the Outlook client logon times in this scenario.
This issue occurs because Exchange 2007 does not track the last logon time for Web Distributed Authoring and Versioning (WebDAV) clients. By default, Entourage clients communicate with Exchange servers by using the WebDAV protocol.
To resolve this problem, install Update Rollup 7 for Exchange 2007 Service Pack 1. For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: