Ex-Nokia employee here - I used to work directly for the CTO of Nokia. It's amazing, but unsurprising, to me the strength of Nokia's phone brand after all these years. There's a lot longer of a story to Nokia's decision not to use Android than most people realize. For example, Intel figured prominently, the Symbian vs. Maemo debate raged internally, discussions with Google were marred by massive cultural differences and arrogance on both sides. I'm surprised no one has written a book.

For what it's worth, Windows Phone was actually an amazing platform for both users and developers, and shows a fundamental rule of technology: There Is No Third Ecosystsm. The most dominant hardware maker (at the time) and software/os maker teamed up with a really great product, but couldn't break the established smartphone duopoly, even though it was only a few years old by that point. I wasn't a Microsoft fan by any stretch (the opposite actually), but even I agreed with the decision at the time, especially after using Windows Phone. First mover advantage is huge, and developers only have so much bandwidth.

Edit: Heh. Apparently someone did write a book. See comments below. Wow.