I have read (sadly) that for the moment, Exchange Server 2013 will not function properly on a server running 2012 R2
Does anyone know if I can run it on a windows 2012 server but the DC's in the domain are running 2012 R2?
I upgraded my domain without looking first.
I should have bought a clue when I couldn't do an in place upgrade on the DCs.
I had to blow it away and start over