Comment Authentication (Score 1) 464
Along with virtualization management, do not virtualize whatever system provides authentication to allow you to manage the VM's (domain controllers in the case of hyper-v). Other than for hardware requirements (PBX, phone interfaces,anything requiring proprietary hardware) everything else is fair game. The list of hardware that can not be accessed by a VM is getting shorter, as virtualization giants have started to support giving VM's some GPU time on the host, as well as access to USB devices.