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Re:Microsoft to Cut Jobs, Take $7.6B Nokia Writedown by RoboSeldon on Wednesday July 08, 2015 @11:32AM (#9852218)
.NET CoreCLR is indeed open source, but I doubt you can use it for Android or iOS.
Re:Microsoft to Cut Jobs, Take $7.6B Nokia Writedown by nacs on Wednesday July 08, 2015 @03:31PM (#9854071)
Why not?

Unity3d has been using Xamarin's .Net to build for Android and iOS (and many other platforms) for years now.

Re:Microsoft to Cut Jobs, Take $7.6B Nokia Writedown by RoboSeldon on Wednesday July 08, 2015 @06:53PM (#9855143)
Because you can't use .NET CoreCLR as it is on Android. You will need to modify it in order to be able to compile it for Android. Here is a discussion about an attempt to modify .NET CoreCLR in order to be able to compile it for Android https://github.com/dotnet/coreclr/issues/1097

On iOS the situation is even worse you will need to have an AOT compiler for C# in order to be able to ship iOS apps in the Apple Store.

You are making a confusion here. Unity doesn't use Xamarin at all, they have an old license (like really old, since before Xamarin even existed) for Mono for iOS and Android.