Those XP, Vista, and Win7 tablets were as big and heavy as a laptop, but cost twice as much - the entry level from Dell or HP were $2K. And, the operating systems were extremely clunky with touch, including that the screen couldn't differentiate between a rested palm and a deliberate user action. It's obvious why they were unpopular - price alone kept people from trying them and finding out about the bad usability. Win8 tablets will be entirely different devices that overcome the limitations of the old style Windows tablets.