This tactic of your phone as your phone, laptop, and desktop is a possible way that I see Microsoft gaining a substantial foothold in the mobile market through its corporate presence. If Microsoft had such a product, IT departments could give you a phone that you also use at your cubicle as your PC and replaces an alternative corporate sponsored phone. In many environments, you have to have a Windows machine, but their isn't enough lock-in for Android or iPhone to avoid being pushed out by a single solution.