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Ballmer at the launch of Microsoft's first tablet, the Windows 8 Surface.
Ballmer never appeared to be completely in charge of Microsoft until 2008 when Bill Gates retired. Here's a look at what we thought of the first year of changes at Microsoft. You can tell by the body language who's in charge.
Microsoft's most successful hardware device has been the Xbox 360. Here, Ballmer and Bill Gates duke it out on a huge screen.