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Before taking over as CEO of Nokia in 2010, Stephen Elop served as president of the Microsoft Business Division. Elop and Ballmer inked a major partnership to make Nokia prime partner for Windows phones.
Stephen Sinofsky former head of Windows left on his own or was booted the company in 2012 after disappointment with his pet project Windows 8. However, he is capable. Can he do what Steve Jobs did upon his return to Apple?
Kevin Johnson has retired twice already. Once from Juniper Networks and once from Microsoft. He did run Platforms and Services for Microsoft before he left.