Unsurprisingly, Motion now has an announcement that you can purchase a Motion tablet shipping with Vista and downgrade the operating system to Windows XP Tablet edition by purchasing a downgrade CD.

Here is the info from their website:

If you have a Microsoft Windows Vista Business system, but need to continue using Microsoft Windows XP:
For a limited time Motion Computing is providing Windows XP Recovery media as a means to downgrade from Windows Vista. Motion Computing customers that have Windows Vista Business "Logo'd Systems" may purchase Windows XP Recovery media until January 31, 2009. Fees may vary.

BTW, if you don't want to do the downgrade yourself, certain Motion resellers can do the downgrade and ship the tablet with XP preloaded.

Please contact Motion at 866-322-9783, option 9 or support@motioncomputing.com for more details.
  • "Logo'd Systems" are Motion Computing Tablet PC systems purchased with a Windows Vista Business preloaded operating system.
  • Holders of MIcrosoft Volume Licensing may continue to exercise their downgrade rights as per their existing agreements.
  • There will be a limit of one Windows XP Recovery media per customer, per serial number for each system with preloaded Windows Vista Business software.
  • Click here for detailed instructions on downgrading to Windows XP
XP Downgrade FAQs (PDF)