Microsoft chairman Bill Gates has revealed that the software giant has sold almost 40 million copies of its new operating system Windows Vista.
Billionaire Mr Gates told delegates at a company conference in Los Angeles that Microsoft bosses had "really been amazed" at the response of customers to Vista – the firm's first new operating system in five years.
He also revealed that Vista, which was released on January 30th, had become Microsoft's quickest selling software.
"We knew that the industry was stepping up to take advantage of those capabilities, but what's happened in the last 100 days has been beyond our expectations," Mr Gates said yesterday in a keynote speech to the Windows hardware engineering conference (WinHEC) 2007.
"As of last week, we've had nearly 40 million copies sold, and so that's twice as fast as the adoption of Windows XP, the last major release that we've had," he added.
More than three quarters, or 78 per cent, of Vista sales have been for the software's premium versions, Microsoft has revealed.
Mr Gate's upbeat message on sales contrasts to earlier fears that take up of the new software might be slow.
Meanwhile the Microsoft founder has also announced further details about the company's forthcoming product, Windows Home Server.
The new operating system, which is due for release later this year, is designed to help multi-PC owners more easily share and protect digital media such as pictures, music, documents and videos.
Announcing new hardware partners for Windows Home Server, Mr Gates stressed that digital devices and media becoming increasingly important and had become an "essential part" of peoples' lives.