The problem with WP was that it was late and offered nothing very special to consumers over android/iOS (and ya, I loved my 920). Consumers had no reason to buy it, developers had no reason to dev for it, a huge vicious circle that would have been difficult to break under the best of circumstances. The war was lost when the WinMo 7 team decided to after Blackberry in 2007, ignoring the iPhone as consequential, requiring that dev/design reset later that was just too late.