Article ID: 2517754 - View products that this article applies to.
Consider the following scenario:
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2496325/ )Description of the cumulative update package for Lync 2010: April 2011
To work around this issue, turn on the tracing feature in Lync 2010 by using the following Lync Server Management Shell cmdlet:
Set-CsClientPolicy -Identity client_policy_name -EnableTracing $true
Note The client_policy_name placeholder signifies “Global” unless the corresponding Lync 2010 client has a customized policy that uses a different name.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.