From the press-release: "Microsoft's history with the OSI dates back to 2005 with the submission of the Microsoft Community License"<p>Well, that is not exactly true. For those who have forgotten the history, or weren't around at the time, this leaked internal document from Microsoft was the proximate cause of OSI taking off: <a href="http://catb.org/~esr/halloween/halloween1.html" rel="nofollow">http://catb.org/~esr/halloween/halloween1.html</a><p>TLDR: Microsoft's loud opposition to, and deep fear of, open source software provided a catalyst and a point of unification for those who supported it.