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Nokia were major contributors to their own demise, and Elop's speech was symptomatic of their internal culture. They were a hardware company first and foremost, and when smartphones came along they really struggled with the pivot to a software-led platform. The software they did produce was buggy as hell, and they didn't have the right people in place to integrate multiple software components into a stable platform.
With plenty of help from Microsoft's Stephen Elop and his burning platform.