On January 16, 2008, Scott Guthrie, General Manager within the Microsoft Developer Division, announced on his blog that the .NET Framework Reference Source will be updated from the standard Microsoft Reference License to the .NET Framework Reference License. This change was based on community feedback about potential impacts of viewing the source with non-Windows operating systems. The .NET Reference Source License working on products similar to the .NET Framework for non-Windows operating systems.

For more information, visit Scott's blog: http://weblogs.asp.net/scottgu/archive/2008/01/16/net-framework-library-source-code-now-available.aspx