How can I step into Microsoft's .NET framework source code?

Question

I\'d like to step into Microsoft\'s source code but cannot.

I followed the instructions at Configuring Visual Studio for Debugging. In particular, I disable

Answer 1

As far as I have observed .NET framework stepping with the reference source works just fine with the guides you find everywhere. With VS SP1 you don't even have to add the path to the reference source server.

But the problem are mismatched versions. The framework assemblies were updated with .NET 3.5 SP1, Vista SP2, Windows 7, ... but their reference source PDBs weren't made available. The corresponding reference source forum seems quite dead, too. I remember reading that it took them a bit longer to push out the initial symbols because they built an infrastructure that would allow them to push new versions quickly. Either that didn't really happen or they don't use it.