Microsoft unveils Windows 8

Microsoft CEO Steve Ballmer's future may depend on the success of Microsoft Windows 8, which he unveiled in New York on Thursday.

Today, Steven Sinofsky, president of Windows, announces the availability of Windows 8 at the launch event at Pier 57 on Thursday, Oct. 25, 2012 in New York City. (Jason DeCrow /AP Images for Microsoft)

Today, Steven Sinofsky, president of Windows, announces the availability of Windows 8 at the launch event at Pier 57 on Thursday, Oct. 25, 2012 in New York City. (Jason DeCrow /AP Images for Microsoft)

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