Microsoft (MSFT) has sold 40 million licenses of its Windows 8 operating system after only one month of availability. Tami Reller, the company’s newly-promoted head of Windows, announced the news at the Credit Suisse 2012 Annual Technology Conference on Tuesday. The executive also revealed that Windows 8 is outpacing Windows 7 in terms of upgrades and that the company’s Windows Store launched with more first-day apps than any other app store. In fact, the size of the store has doubled since launch and “a number of apps” have even surpassed the $25,000 revenue mark. Microsoft’s latest operating system was launched last month with a massive $1.5 billion marketing campaign. Despite the large number of users upgrading to Windows 8, sales of Windows 8 PCs are said to be well below the company’s internal projections.

Dan joins the BGR team as the Android Editor, covering all things relating to Google’s premiere operating system. His work has appeared on Fox News, Fox Business and Yahoo News, among other publications. When he isn’t testing the latest devices or apps, he can be found enjoying the sights and sounds of New York City.