Windows 7 Downgrade Rights

Yes you can downgrade Windows 7 (Professional or Ultimate) to Windows XP Professional but either only until April 2011 or the first Windows 7 Service Pack is released, whichever comes first.  Please, please, please don’t downgrade to Windows Vista unless you’re a masochist! 😉

Microsoft OEM Partner Center – Understanding Downgrade Rights

http://download.microsoft.com/download/6/8/9/68964284-864d-4a6d-aed9-f2c1f8f23e14/Downgrade_Rights.docx