Today, Microsoft announces via blog entry the shutdown of CodePlex, its 11-year-old site where programmers could host and share the code for their software projects. When it was founded in 2006, CodePlex was one Microsoft's biggest steps into the world of open source software — where any programmer, anywhere can download and tweak the code to their liking. At the time, Microsoft saw free open source software, including the Linux operating system, as a major competitive threat. In that blog, Microsoft Corporate VP Brian Harry writes that the CodePlex shutdown is because the world of open source has almost entirely moved over to GitHub's very similar service . GitHub, a $2 billion San Francisco startup, rose from humble origins in 2008 to becoming known as the "Facebook for programmers." "O ver the years, we’ve seen a lot of amazing options come and go but at this point, GitHub is the de facto place for open source sharing and most open source projects hav