When two instances of a Microsoft Office Communications Server 2007 R2, Group Chat client are started at the same time, a race condition occurs. Additionally, this causes the Office Communications Server 2007 R2, Group Chat client to crash.
To resolve this issue, install the following cumulative update:
2549043 Description of the update for the Office Communications Server 2007 R2 Group Chat client: June, 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2545864 - Last Review: Jun 9, 2011 - Revision: 1