Over the past decade, speculation has centred on some potential candidates, but they have all left the company.
Steve Ballmer is remodelling Microsoft as a much more integrated operation in an attempt to take on Apple and Google at their own game.
Microsoft CEO Steve Ballmer is trying to dismantle fiefdoms within Microsoft that date back to the 1990s.
The departure of 23-year company veteran Steven Sinofsky, head of Microsoft's Windows unit, was unexpected.
The first generation of touch-enabled tablets running Windows 8 is expected on the market in about 12 months.
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