Microsoft (NASDAQ:MSFT) has announced that it has sold 60 million Windows 8 licenses since debuting its newest operating system, a figure that approximately matches its Windows 7 sales. However, in this video, Motley Fool tech and telecom analyst Andrew Tonner tells us the biggest difference between the launch of Windows 7 vs. Windows 8: The mobile revolution had not yet begun when Windows 7 launched back in 2009. That means that only matching those previous numbers, instead of exceeding them in this new mobile landscape, may not be enough.