Microsoft chair Bill Gates today noted at a European news conference that sales of Windows Vista have reached 140 million copies worldwide. The update is the first since the company crossed the 100 million mark at the start of the new year, although Gates doesn't clarify when the company reached the newer threshold. This demonstrates that Vista continues to sell at a "very rapid" rate, according to the Microsoft co-founder.

If tracked between January and April, the number represents about 10 million copies of Vista sold per month in the first third of 2008 and signals a slight increase in the sales rate for the operating system, which averaged at just over 9 million copies sold per month in 2007. However, the sales rate is half that of the Windows update's initial results in the first two months of its launch, when it sold as many as 20 million copies per month to cater to early demand.

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