40 million Vista copies sold

Microsoft has sold nearly 40 million copies of Windows Vista so far, Bill Gates told a crowd of hardware developers Tuesday.

That's more than the total install base of Windows' largest competitors, Gates quipped as he began his keynote at the Windows Hardware and Engineering Conference (WinHEC) here.

"As of last week, we've sold nearly 40 million copies," Gates said. "That's twice as fast as the adoption of Windows XP, the last major release we had."

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