I don't want to be come across as knee-jerky anti-Microsoft (I haven't used .NET; I admit ignorance there), I'm just surprised that it didn't acknowledge the one example of an actor system that programmers are likely to have heard about. It seems like it would be useful for comparison.

Besides, Microsoft employs Simon Peyton-Jones, among others, and they fund serious programming language research in various ways. I'm not implying it's dishonest on their part, I just found it a bit odd.