Symptoms
Consider the following scenario:
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A cumulative update package for Microsoft Lync 2010 that is dated February 2012 or a later update for Lync 2010 is installed on a computer.
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User A logs on to the computer by using credentials that are shared with user B.
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User A signs in to Lync 2010 on the computer by using the credentials of user A.
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User A keeps Lync 2010 running and then logs off, restarts, or shuts down the computer.
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User B logs on to the computer by using the shared credentials and then starts Lync 2010.
In this scenario, Lync 2010 does not prompt user B for credentials, and user B signs in to Lync 2010 as user A.
Note This issue does not occur if user A exits or signs out of Lync 2010 before user A logs off, restarts, or shuts down the computer.
Cause
This issue occurs because the Lync 2010 client certificate is not deleted from the computer when user A logs off, restarts, or shuts down the computer.
Resolution
To resolve this issue, install the following cumulative update:
2791382 Description of the cumulative update package for Lync 2010: March 2013
More Information
For more information about the cumulative update for Lync 2010 that is dated February 2012, click the following article number to view the article in the Microsoft Knowledge Base:
2670326 Description of the cumulative update package for Lync 2010: February 2012 For more information about a related issue, click the following article number to view the article in the Microsoft Knowledge Base:
2666324 The Windows logoff process is delayed when Lync 2010 is started
