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Gates said an accelerating consumer shift to digital lifestyles had helped make the operating system the fastest-selling in history, and that premium editions have accounted for 78 per cent of Vista sales. Sales have slowed since the initial rush - 20 million copies were sold in the first month.

'I'm really thrilled at how this has come together,' said Gates during a speech at Microsoft's Windows Hardware Engineering Conference 2007 in Los Angeles.

Vista, which Microsoft introduced on January 30, was the first major operating system upgrade in more than five years from the world's biggest software maker.

Gates

Gates also said that the company named its next-generation Windows Server software - formerly known as 'Longhorn' - Windows Server 2008.

Windows Server is the server operating system equivalent to the Vista PC operating system, with an emphasis on many of the same features, such as better security.

Microsoft, which controlled an estimated two-thirds of the global server software market in 2006, has said the product is on track to debut in the second half of 2007.

Gates said Windows Vista and Windows Server 2008 will provide a platform for hardware innovations and drive increased demand for a wide range of new PCs and devices.

He cited a study by research group IDC that projects there will be a $120 billion economic impact from product and services revolving around Windows Vista and Windows Server 2008.

The company also said that three new hardware manufacturers - Gateway, LaCie and Medion - plan to build products for Windows Home Server.

That software is aimed at helping families with multiple PCs easily centralise, share and protect digital content, such as pictures, music, documents and videos.