According to this article:http://www.microsoftstore.com/store/msstore/en_US/pd/productID.216644600/categoryID.50726100/list.true
someone who has Windows XP installed should be able to move to Windows 7 by purchasing the Upgrade Version
Clicking on the link "Upgrading From Windows XP to Windows 7 (Custom Installation)" actually takes me to an article that deals with "Upgrading From Windows Vista to Windows 7 (Custom Installation)"...
I called Microsoft's Personal Support team (at 800-936-5700) and they told me that if I want to switch from Windows XP (SP3) to Windows 7, I would need to purchase the Full Retail Version
of Windows 7.
So: Can I purchase the Upgrade Version
of Windows 7 if I currently have a legit copy Windows XP (SP3) installed, or is it the Full Retail Version
that I have to buy? (PS: I am aware that switching from Windows XP to Windows 7 requires a clean install! But can I do the move by using the Upgrade Version
of Windows 7??)