Microsoft released Yesterday Exchange Server 2013 SP1 and in this new version we have several new features and support for Windows Server 2012 R2 for both OS and Active Directory.
Read more at MSExchange Team post: http://blogs.technet.com/b/exchange/archive/2014/02/25/exchange-server-2013-service-pack-1-available.aspx
Here is the link to download it: http://www.microsoft.com/download/details.aspx?id=41994
Here is the release notes: http://technet.microsoft.com/en-us/library/jj150489(v=exchg.150).aspx
What’s new in SP1? http://technet.microsoft.com/en-us/library/jj907309(v=exchg.150).aspx