On the Microsoft campus in Redmond, Wash., on Jan. 21.

Microsoft’s Revolution deal is the latest proof the company is serious about open source

A significant percentage of Microsoft’s revenue comes from the sale of proprietary software like Office and a little thing called Windows. Despite that legacy, though, the technology giant in the past year has made a point of championing free, open-source software, and yesterday’s acquisition of Revolutions Analytics shows the strategy is still firmly in place.