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Tami Reller is a 12-year veteran of Microsoft and is Executive VP of Marketing for the Windows team.
Satya Nadella has the advantage of having served in several management positions aorund Microsoft and is now president of the Server and Tools Business.
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.