This is my interpretation: Microsoft's biggest threat right now is that to be a viable mobile developer at the moment you pretty much need to buy a Mac and embr

This is my interpretation: Microsoft's biggest threat right now is that to be a viable mobile developer at the moment you pretty much need to buy a Mac and embrace OSX. Once you have done that you are obviously not running Visual Studio any more but will be using XCode and cross platform tools like Eclipse. Then you are further extremely unlikely to write things in C#. So this is about saying to the existing C# developers, "don't leave, don't buy a Mac, we are going to support you to write everything you need (Android, iOS etc.) without leaving the comfort of Visual Studio".