get it here
the desciption should be on this link but its not working ?
http://support.microsoft.com/kb/970275 some kind of bad/wrong link on this page, when clicking the “972402”
Issue that this update package fixesThis update package fixes the following issue:
972402 (http://support.microsoft.com/kb/972402/ ) Office Communicator 2007 R2 runs concurrently with Office Communications Server 2007 R2 Attendant