Microsoft Exchange Team announced earlier Today the Exchange Server 2013 RTM.
Today, Exchange Server 2013 RTM Cumulative Update 2 (CU2) was released to the Microsoft Download Center. In addition to this article, the Exchange 2013 RTM CU2 release notes will also be available.
The final build number for Exchange 2013 RTM CU2 is 15.0.712.22.
Read more at source: http://blogs.technet.com/b/exchange/archive/2013/07/09/released-exchange-server-2013-rtm-cumulative-update-2.aspx