Finally!
Finally a reason to run Windows for ARM over Android. Now they only need to find a way to automatically adapt desktops UIs to make them usable on small touchscreen devices. Alternatively they could introduce a phone with stylus and keyboard.
The point is that they cannot out-iPhone the iPhone. If they want to succeed, they need to build on something only they can provide... in the case of Microsoft that's running legacy Win32 and Win16 code.