Microsoft announced on Friday that it would be joining the Apache Software Foundation, one of the leading organizations in the open-source world. Microsoft became a platinum sponsor of the ASF, which costs $100,000/year and is the highest level of sponsorship that the foundation offers. In a blog posting announcing the sponsorship, Sam Ramji, Microsoft's senior director of platform strategy and head of its open source software lab, indicated that this demonstrates Microsoft's interest in working along with Apache on many projects. At the same time, he wrote that this does not mean Microsoft is turning its back on proprietary software, including its IIS Web server.