Article ID: 2464874 - View products that this article applies to.
Consider the following scenario:
Note In this scenario, you are expected to receive the following error message:
Can not sign in to Lync because this sign-in address was not found. Please verify the sign-in address and try again. If the problem continues, please contact your support team.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2467763/ )Description of the cumulative update package for Lync 2010: January 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.