I’ve been running Windows 7 since beta and I only just found out about this feature called XP mode for Windows 7 (Professional and Ultimate versions only). I still haven’t tried it much, I have yet to see a need for it, and I run tons and tons of old junk. However, in the off chance that you have an application that will run in Windows XP, but just refuses to function in Windows Vista or Windows 7, this tool may be for you.
I won’t go into to much detail, but it’s built on top of Windows Virtual PC technology (which used to be Microsoft Virtual PC 2007). Windows XP mode is basically an installation of Windows XP, that runs transparently in a Virtual machine on your Windows 7 desktop. Complicated … ish … the technology is complex, but the simple integratioin makes the usage very simple. Whatever the difficulty level, it’s Friggin Cool for Shizzles!!!
http://www.microsoft.com/windows/windows-7/features/windows-xp-mode.aspx
This XP mode is only supported in the Professional and Ultimate editions of Windows 7, just another reason to shy away from using the Home versions in a business environment. It is a seperate download, but is free.