We've got two servers:
1) SBS 2011 - Functions as application, file, Exchange server. (domain controller)
2) WIN 2012 - DB server.
We've reached almost 65 users (max 75) on the SBS '11 and as you can imagine the i/o and memory consumption on this machine is intense especially when the RAM's limited to 32GB.
I want to leave Exchange on the SBS and migrate the rest to the WIN 2012 srv.
This means i only have to acquire CAL's for the WIN 2012 srv and don't have to buy Exchange 2013 with the very expensive Exchange CAL's.
So my question is,can we have change the 2012 srv into the domain contoller and leave the SBS 2011 as the Exchange mail server?