Disgruntled Fungus writes "A few months ago, we discussed Microsoft's intention to open source the .NET libraries. According to a developer's official blog, the source code is now available. The source to libraries such as System, IO, Windows.Forms, etc. can now be viewed and used for debugging purposes from within Visual Studio. Instructions for doing so have also been provided. The source code has been released with a read-only license and 'does not apply to users developing software for a non-Windows platform that has "the same or substantially the same features or functionality" as the .NET Framework.'"