Microsoft Opens up the .NET Class Libraries Source Code

By Michael Foord -
Microsoft has just announced that it will be making the source code to a lot of the major .NET class libraries available. They will not be under an open source library, but it is still a big step.
Miguel de Icaza comments on what this does (and doesn't) mean for Mono. Mono is already distributing some Microsoft code (including IronPython...) that is available under their permissive license (which will soon be renamed the 'open' license - presumably in response to the OSIs request):

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