http://blogs.technet.com/b/nexthop/archive/2012/10/09/lync-server-2013-preview-using-set-cscertificate-for-audio-video-edge-and-oauthtokenissuer-certificate-maintenance.aspxThe new certificate maintenance feature in Lync Server 2013 Preview allows Lync Server administrators to acquire and stage Edge service certificates and/or a new server-to-server authentication (OAuth) prior to the expiration of the current certificateen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)