Specifying Antivirus Scanning Exclusions

Commonly overlooked.........

To ensure that the antivirus scanner does not interfere with the operation of Microsoft Lync Server 2010, you must exclude specific processes and directories for each Lync Server 2010 server or server role on which you run an antivirus scanner. The following processes and directories should be excluded   http://technet.microsoft.com/en-us/library/gg195736.aspx