Information on Microsoft's "Virtual Machine" technology seems to be appearing now,
we've got some builds internally and they look really good.
The ability to base a new VM on another and only store the changes is really good,
saves loads of disk space! You can also drag/drop and use the clipboard between
VMs which is handy
Microsoft Virtual PC information here:
https://www.microsoft.com/windowsxp/virtualpc/
Microsoft Virtual Server Information and Beta details here:
https://www.microsoft.com/windowsserver2003/evaluation/trial/virtualserver.mspx