Article ID: 2568561 - View products that this article applies to.
A user is displayed two times in a membership list of a Microsoft Lync Server 2010, Group Chat channel. This issue occurs when the following conditions are true:
This issue occurs because a procGetExplicitRoleList stored procedure is mishandled. The stored procedure is used to pull the membership list for a specific chat room.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2514984/ )Description of the update for Lync Server 2010 Group Chat: November 2011