First, Xamarin might not be Microsoft, but those languages are developed and controlled (feature wise) by Microsoft, and are best used and more mature with the MS ecosystem. Plus, Xamarin works professionally with MS for quite some time (and a complete acquisition/acqui-hire isn't even that far fetched).
Second, Clojure is not used in .NET by anyone but 10 people. That port is if not abandoned, very near it. And even if it was, most Clojure/JVM software is rendered unsuable on the CLR. For all intends and purposes Clojure is 99.9% a JVM language first (and Clojurescript which is also not .NET).
First, Xamarin might not be Microsoft, but those languages are developed and controlled (feature wise) by Microsoft, and are best used and more mature with the MS ecosystem. Plus, Xamarin works professionally with MS for quite some time (and a complete acquisition/acqui-hire isn't even that far fetched).
Second, Clojure is not used in .NET by anyone but 10 people. That port is if not abandoned, very near it. And even if it was, most Clojure/JVM software is rendered unsuable on the CLR. For all intends and purposes Clojure is 99.9% a JVM language first (and Clojurescript which is also not .NET).