I don't see Microsoft's problem here being fragmentation. Sure, some versions of Windows will run the Aero desktop and some won't, but everyone will have acces

I don't see Microsoft's problem here being fragmentation. Sure, some versions of Windows will run the Aero desktop and some won't, but everyone will have access to the same touch interface in Metro UI. This is markedly different from the Android ecosystem in which every device has its own spin on the interface. Further, it was clear from Build that MS is clearly propping up Metro as the future of Windows, regardless of whether you prefer mouse and keyboard. I think it's safe to say that need for the Aero desktop will decline over time. The real problem Microsoft has then is not fragmentation, but getting users to accept its vision.