You can bet Microsoft will make Windows 8 ARM compatible. They don't want to lose the tablet market and since Intel is having such a hard time getting into that

You can bet Microsoft will make Windows 8 ARM compatible. They don't want to lose the tablet market and since Intel is having such a hard time getting into that market, they can't simply rely on them. And if you're going to suggest WP7 for tablets, don't. Microsoft will only do that in worst case scenario if Windows 8 will prove to not be good enough for tablets. They don't want to get $10 per license when they could get $50, and that's especially true if touch/mobile computing will replace desktop computing.