Notable the Microsoft has not one but two actor model "frameworks": Orleans (for .NET) and Dapr Actors (for containerized workloads).

The .NET ecosystem itself has another mature actor-based framework in Akka.NET, being probably closest to the Erlang/Elixir supervisor style, in C#/F#.

Probably even more, most folks aren't aware of how many research is sponsored by Microsoft Research across all their university sites.