The More Interesting Question
The interesting question that was apparently not asked was the split between Vista and Win7 for the non-XP users. With MS ending XP support, users must migrate somewhere. My guess is that at this point no one is migrating from XP, but Windows 7 is the next landing spot for Windows users. After viewing Windows 8, I can't imagine any business or desktop users upgrading there. It may be great for phones and tablets (mine still use Android) but the interface is brutal for business and home spreadsheet and/or word processing.