Article ID: 2868300 - View products that this article applies to.
Consider the following scenario:
To resolve this issue, install the following security update:
(http://support.microsoft.com/kb/2817465/ )MS13-054: Description of the security update for Lync 2013: July 9, 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.