If you are interested in running Windows Vista on Virtual PC or Virtual Server, here are several tips on how to optimize your configuration.
Currently, I am running Windows Vista on the VMware Workstation platform and the Virtual PC platform. My only regret with working with Vista, is that I cannot get aero glass to work. I am sure in new releases of Virtual PC and VMware Workstation, they will fix this.
Note: If you are not familiar with aero glass, here is a definition.
For more optimization tips on Virtual PC, see the following download on optimizing Virtual PC.