Article ID: 2586030 - View products that this article applies to.
The following event is logged in the Lync Server log on a Microsoft Lync Server 2010 Group Chat server:
Log Name: Lync Server
This issue occurs if you create a user in Active Directory Domain Services whose distinguished name contains more than 256 characters, and then you add this user to a distribution group.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2514984/ )Description of the cumulative update for Lync Server 2010, Group Chat: November 2011
Note After you apply this update, the Group Chat server supports users whose distinguished names contain up to 384 characters.