In a surprise move, Microsoft said today it is releasing the reference source code for the .NET Framework libraries, a key step toward opening up the proprietary development platform.
Developers will be able to review and debug .NET source code with Visual Studio 2008 and .NET Framework 3.5. Released under the Microsoft Reference License, developers are able to view, but not modify or distribute, the reference source code.
Read the full Microsoft Takes Step Toward Opening .NET 3.5 Framework