Microsoft has sold more than 100 million units of Windows Vista since releasing the software 14 months ago.
The milestone was revealed last week when the company released its quarterly earnings report.
The second quarter also set a record for Microsoft of $16.37bn in revenues, a 30 per cent increase over the same period last year.
"We are pleased with the progress of Windows Vista in the market," said Kevin Johnson, president of Microsoft's platforms and services division.
"We have hit our stride with partners and customers and look forward to the release of our first service pack later this quarter."
Microsoft claimed that its Client branch has grown by 20 per cent since Vista was released to business customers in November 2006.
Chairman Bill Gates predicted the 100 million Vista milestone at the operating system's consumer release in January 2007.
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