rights_VISTA_Business_Ultimate_to_XP Pro Vista News Discuss rights_VISTA_Business_Ultimate_to_XP Pro in the Windows Vista forums; http://www.boxxet.com/Windows_Vista/...P_Professional . This is old news which i posted way back in June in our SuperUser area, but still worth to mention to everyone as it'...

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http://www.boxxet.com/Windows_Vista/...P_Professional.

This is old news which i posted way back in June in our SuperUser area, but still worth to mention to everyone as it's a little known fact. Whenever you buy a new laptop make sure you get OEM VISTA Business or the Ultimate version preinstalled as according to Microsoft you are eligible to downgrade these version (only!) to XP Professional.
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Can I downgrade my OEM version of Windows Vista Business to Windows XP Professional?

Yes. OEM downgrade rights for desktop PC operating systems apply to Windows Vista Business and Windows Vista Ultimate as stated in the License Terms. Please note, OEM downgrade versions of Windows Vista Business and Windows Vista Ultimate are limited to Windows XP Professional (including Windows XP Tablet PC Edition and Windows XP x64 Edition). End users can use the following media for their downgrade: Volume Licensing media (provided the end user has a Volume Licensing agreement), retail (FPP) (edit: Full Packaged Product), or system builder (edit: edition) hologram CD (provided the software is acquired in accordance with the Microsoft OEM System Builder License). Use of the downgraded operating system is governed by the Windows Vista Business License Terms, and the end user cannot use both the downgrade operating system and Windows Vista Business. There are no downgrade rights granted for Windows Vista Home Basic or Windows Vista Home Premium.
The complete downgrade chart document can be found HERE