Microsoft to offer XP-to-Windows 7 upgrades
But XP upgrade customers will have to do a "clean" installation of Windows 7, meaning that all data on their machine will be lost.
Gregg Keizer (Computerworld (US)) 04/02/2009 12:10:00

Microsoft Tuesday confirmed that it will sell what it calls "upgrades" for Windows 7 to users running the aged Windows XP operating system.

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