"We have seen a significant increase in the number of Windows 8 certified systems since general availability at the end of October," Reller said. "There are now more than 1,700 certified systems for Windows 8 and Windows RT."
Reller did not say how many of its new Surface tablets Microsoft had sold.
Earlier this week Microsoft also highlighted strong growth in developers building for Windows 8. Since the opening of the Windows Store the number of apps has quadrupled and Microsoft says it has passed the 100 million app download mark - just two months after general availability.