Article ID: 2796758 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the Group Chat server encounters an exception when it tries to synchronize with Active Directory Domain Services (AD DS).
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2803651/ )Description of the cumulative update for Lync Server 2010, Group Chat: March 2013
For more information about a similar issue, click the following article number to view the article in the Microsoft Knowledge Base:
2783949For more information about how to deploy Group Chat Server, go to the following Microsoft website:
(http://support.microsoft.com/kb/2783949/ )User in a DG does not receive a chat room invitation when the user signs in to an Office Communications Server 2007 R2, Group Chat client
How to deploy Group Chat Server