Mary Jo Foley of ZDNet reports that Microsoft invited free software legend Richard Stallman to speak at its Microsoft Research headquarters this week. Stallman, known for launching the Free Software Movement to develop the GNU operating system, was and still is a staunch Microsoft critic. Stallman delivered his standard talk around four freedoms. Foley wrote that Microsoft Azure Chief Technology Officer Mark Russinovich tweeted this morning (September 5): “In other OSS-related news, Richard Stallman visited campus yesterday and gave a talk at Microsoft Research.” (Source: ZDNet)