Originally Posted by nathris
Numerous youtube demos have shown that Windows 7 on a tablet works just fine. The only thing that I can see getting a redesign are some of the system options and the start menu.
Windows Phone 7 was designed for <4" devices, and its fairly anemic as it is. Porting it up would be a disaster. It doesn't even support multitasking! It would probably be less work to start from scratch.
I don't really take youtube videos for source, sorry. In my experiences with W7 on touch, if it's not a stylus, it sucks. Sure, it doesn't suck all over, but it does suck in a lot of places. Then you have the problem of not 1, not 2, but 3 major MS operating systems. WP7, W7x86, W7ARM. Is there a market for an appless desktop experience? I doubt that a large quantity of people will buy tablets compared to phones, so the app "market" won't be as large.
Add on to that the fact that MS will most likely have 2, if not 3 tablet OS's in the market at once (W7x86 because people still want to use the apps, W7ARM because of the battery life etc, and maybe WP7, it's been hinted at) and MS tablet market becomes a mess.
On the otherhand, you can take WP7, add features such as multitasking, and such that are in the works for it anyway, scale the UI up, and there. It already comes with an MS office suite iirc, it already has a good sized customer base, and apps are already being made for it.