I haven't seen Maemo so I couldn't talk to its quality vs win phone, but there is more to the argument than product quality. With win phone they got reduced dev costs since they didn't have to support the OS, and reduced marketing costs since MS was promoting win phone so heavily. Add on top of that a larger App ecosystem(sure MS' is pathetic but it beats starting from scratch) without having to run a developer program and you have a strong argument. The only question then is why win instead of android? I think that is easily answered by his background and how well non Samsung android manufactures are doing.