A possible way for MS to break into the mobile market might be for them to buy a carrier.. T-Mobile? Sprint? US Cellular? Somebody.. That will get a foot in the door.. Then slowly they can make their own rules, make their own pricing, and maybe make a dent..
Without that I don't see how MS can become relevant in the mobile market.. Right now they offer nothing..
Concerning the mobile market---Too little and too late doesn't even begin to explain MS problems right now.