Article ID: 2520144 - View products that this article applies to.
Consider the following scenario. Your mail submission Uniform Resource Identifier (URI) is the same as the email address of a security group or a distribution group. You send an instant message to another user in Microsoft Lync 2010. In this scenario, your instant message is not delivered.
Note This issue does not occur if the user searched for you in Lync 2010 before you send the instant message.
This issue occurs because the security group or the distribution group is returned instead of your contact when another user searches your mail submission URI.
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, use one of the following methods:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.