Lync 2013 cumulative updates explained

http://www.zerohoursleep.com/2013/07/lync-server-2013-cumulative-updates-cu2-july-2013-installation-workflow/

http://blogs.technet.com/b/dodeitte/archive/2013/07/02/how-to-verify-if-lync-server-2013-database-updates-completed-successfully.aspx