The big news is here 🙂 Exchange Server 2013 Service Pack 1 Coming in Early 2014 Few notable improvements are: Windows Server 2012 R2 Support S/MIME support for OWA Support for S/MIME Edge Transport Server Role For further details , check the Exchange team blog @ http://blogs.technet.com/b/exchange/archive/2013/11/20/exchange-server-2013-service-pack-1-coming-in-early-2014.aspx