I currently have a win2k3/win2k8 environment. I have a win2k3 DC (BDC) and a win2k8 DC GC (PDC). We now have a win2k12 server with three VMs, one being a DC with win2k12 as the OS replacing the win2k3 DC. Should the win2k12 DC be the GC server with the FSMO rules or should I leave that on the win2k8 box and change that when the win2k8 server is being replaced? What would be your recommendation?