http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2015/06/17/Why-am-I-leaving-the-Windows-Phone-platform-for-good-today.html
On PCs, what Microsoft gives you is the same for all OEMs. The same on Android. So, Microsoft can offer all the ‘Lumia’ exclusive apps to all OEMs, and make them part of the system, available for everyone. But wait, that way, OEMs would be able to differentiate using exclusive apps, and Microsoft would have nothing to sell its devices.