Virtual PCs seems to have their place in Windows Vista as well... VMWare Workstation and Virtual PC 2004 are working great on Windows Vista 5600 RC1... Here is some screenshots of Windows XP Professional installation on VMware Workstation hosted by Vista 5600 RC1...
I would also like to point out that the Virtual XP installation runs as fast as the hst system does. I think this is because of the Superfetch service avaliable in Windows Vista... this is unbelibable... I never had such a great performance in a Virtual Machine, at least not as fast as this current installation... Windows XP feels like just another host system!!
Good luck to those Virtaul Pcs fanatics like me!!
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