Article ID: 956734 - View products that this article applies to.
When one user locks the desktop on a Windows Server 2008-based computer, the presence status of Microsoft Office Communicator 2007 changes to Away for all Terminal Server users.
To resolve this problem, install the update that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/957707/ )Description of the update for Communicator 2007: October 24, 2008
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.