Comment by sparkie

Microsoft originally only released a specification for V.2 of C# and the Common Language Runtime (ECMA-334 and ECMA-335) - attached to it a promise that they would not sue, iff the framework was "implemented in whole" - which was very vague in that it didn't specify what could be included or omitted in order to make it compatible with other platforms. The clause was obviously added to prevent fragmentation of the platform though - ensuring that it stayed compatible with MS's product, and thus they'd continue to hold control over it.

C# 2.0 is nearly a decade old now - and mono certainly hasn't limited itself to it. Absolutely none of C# 3, 3.5, 4.0, 4.5 was ever released as an open specification or as open source software until now - yet these are the versions mono and everyone was using.

So the "MONO FUD" was never actually FUD, it was legitimate concerns about the lack of openness of the technology. Those are no longer concerns (about this release version) - and we can be glad that RMS et al were "wrong" about this one (When they were in fact, absolutely right at the time.)