The X.1 editions always do far better. We learned that with Windows 3.0/3.1, Windows 95/98, and Win 2000/XP. Looking at the internal versions, Windows 95 is 4.0 while Windows 98 is 4.1, Windows 2000 is 5.0 while XP is 5.1, and Vista is 6.0 while Windows 7 is 6.1. Windows 7 fixed everything that was really wrong with Vista. It really doesn't surprise me that it is doing a lot better than Vista. These adoption lines are virtually the same as Windows 2000 compared to Windows XP.