OAB Improvements in Exchange 2013 Cumulative Update 5
Microsoft Exchange Team announced OAB changesin the new rollup update for Exchange Server 2013.
Cumulative Update 5 (CU5) for Exchange Server 2013 will be released soonTM, but before that happens, I wanted to make you aware of a behavior change in the Offline Address Book that is shipping in CU5. Hopefully this information will aid you in your planning, testing, and deployment of CU5.
Read more at source: http://blogs.technet.com/b/exchange/archive/2014/05/13/oab-improvements-in-exchange-2013-cumulative-update-5.aspx