Windows 7 Tip: 
Windows only: Want your XP inside Vista or vice-versa? Virtual PC 2007 (3 years older and wiser than the 2004 edition) can run several versions of Windows on one physical PC.
You’ll need a full license of that other version of Windows to run it with Virtual PC, which can share the internet connection, hard drives or only certain folders between host and virtualized OS seamlessly. Virtual PC 2007 is now Vista compatible (but only runs on the Ultimate, Enterprise and Business editions as well as XP Pro), and it’s a free download courtesy of Microsoft.
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