Comment by vachina
Elop was the trojan horse that killed Nokia. He worked at MSFT prior to this and single handedly destroyed Nokia. The N9 was revolutionary on its own; GPU accelerated UI, sleek looks, Maemo OS, it is a device people would actually want over the limping Symbian that never fully adapted to touch-only, or the useless Windows Phone 7.
No developer dared to touch Maemo because its future was so uncertain due to the switch to WP. My dad was one of the early Lumia adopters and it was so limiting in what it can do.
Symbian was the core OS, phone manufacturers build the GUI on top of it.
Series 60 was the dominant Nokia UI at the time, but then that received a shake-up with Belle?
Fun fact: Until Nokia bought them, Symbian devs never got actually see any phones that were being built, unless you worked in a specific team that had access restrictions to even enter.