I'm with everyone else that as written the proposal makes no sense, but there may be big portions of Windows, including probably almost all of the kernel, as we

I'm with everyone else that as written the proposal makes no sense, but there may be big portions of Windows, including probably almost all of the kernel, as well as much of pre-XP versions of Windows, that can be released as open source without much revenue impact. Same probably goes for portions of .NET, Office, etc. In fact .NET and Visual Studio probably make the most sense. They should strive to move .NET closer to where Oracle is with Java/JVM. The problem with Microsoft's platform strategy at this point is that they control too much of everything, which means third parties cannot meaningfully compete and contribute to the ecosystem, which of course leads to a vicious cycle. There's a middle path somewhere that allows Microsoft to open-source enough that their open-source stack is competitive, but not such that it cannibalizes their existing businesses.