User can't perform actions as a delegate after logging off from a Lync 2010 Group Chat client

Symptoms

Consider the following scenario:

• A Group Chat server is deployed in a Microsoft Lync Server 2010 environment.

• User A is a delegate of user B.

• User A signs in to a Lync 2010 Group Chat client in the environment.

• User A logs off from the client.

In this scenario, user A cannot perform actions as a delegate even though user A is displayed as a delegate in the account for user B. 

Resolution

To resolve this issue, install the following cumulative updates:

• 2859577 Description of the cumulative update for Lync 2010 Group Chat: July 2013

• 2859585 Description of the cumulative update for the Lync 2010 Group Chat Administration Tool: July 2013