Released: Exchange Server 2013 Service Pack 1 – Exchange Team Blog – Site Home – TechNet Blogs:
Okay I’ll admit I was slightly dragging my feet on the proof of concept migration blogging project because I was HOPING that sp1 for Exchange 2013 would come out that brings support of Exchange 2013 to the 2012 R2 platform. So now I can use 2012 R2 as the platform of choice for deployment.
Windows Server 2012 R2 support – Exchange 2013 SP1 adds Windows Server 2012 R2 as a supported operating system and Active Directory environment for both domain and forest functional levels. For the complete configuration support information refer to the Exchange Server Supportability Matrix. This matrix includes details regarding Windows Server 2012 R2 support information about earlier versions of Exchange