http://blogs.technet.com/b/omers/archive/2012/04/07/try-microsoft-lync-for-free.aspxThere are two ways to try Microsoft® Lync® before you buy. You can either download a 180-trial version of Lync Server 2010, or you can try Office 365, which includes Lync Online, for 30 days. Get at http://lync.microsoft.com/en-us/get-lync/Pages/try-lyncen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)