I need physics engine to simulate game world on server. I googled for .Net physics engines and they all were released in 2006-2009. So is there any good physics engine that I can use?

What I need from engine is box, spheres collisions..

Update: sorry forgot to mention i need 3d engine

Update: In case someone will need managed physics engine look at Jitter, it's pure managed and from the developer of JigLibX

c# .net physics collision-detection server-side
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