To this day, I still think
That the best way forward for Nokia was to improve the Symbian GUI to a level where it was simply competitive, and make a play for its own distinct ecosystem. They had the numbers back then. They were also stuck up their own arses.
That's not a complaint about Windows Phone. I carry two Nokia Windows Phone devices (corporate 620 and the personal 720 that I use for local SIM cards when travelling, in addition to my contract Samsung S3), and it's a very competent mobile OS. I wish Microsoft and Micro-Nokia well.
Then again, Microsoft also had a great mobile OS when the iPhone happened (loved my TyTn). They did less than Nokia and Palm! Sad, isn't it? Google went from a standing start while Nokia merely needed to evolve. The wisdom of hindsight strikes again.