Hi, we have several ( 4 with an additional spare ) new Dell servers that are all set up with Hyper-V and each is hosting several virtual machines on them. We have a 2003 AD and want to upgrade to 2008 AD and remove the 2003 64-bit domain controllers (older physical computers). Doing the research it looks like it is not recommended to put all of your DCs (or any according to some) on a virtual machine. Need some opinion on that, but also on if it is safe to make the actual hosting server a DC knowing that I can't reboot it without killing all of the VMs on that host. I rarely ever have to do a non-scheduled reboot of a DC so I'm anticipating the same once we go to 2008 DCs. Opinions requested for best way to go. I would like to add two DCs. Also, I have a remote location with a 2003 DC that I can't replace right now. Can it remain as a DC even though it is 2003 or do I have to remove that role from it?