Microsoft's second quarter financial results have revealed just how many copies of Windows 7 the software giant has shifted since it went on sale in October 2009.

While announcing record revenue, sales figures of 60 million Windows 7 licenses from Microsoft make it the fastest selling operating system ever.

With revenue up 14% compared to the same period the year before, the success is being credited to the launch of the new OS: "Exceptional demand for Windows 7 led to the positive top-line growth for the company", Peter Klein, chief financial officer at Microsoft said.

"This is a record quarter for Windows units", added Kevin Turner, chief operating officer at Microsoft. "We are thrilled by the consumer reception to Windows 7 and by business enthusiasm to adopt Windows 7".