Symptoms
Consider the following scenario:
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A Group Chat server is deployed in a Microsoft Lync Server 2010 environment.
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User A is a delegate of user B.
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User A signs in to a Lync 2010 Group Chat client in the environment.
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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: