Are there any real MMOs where the server engine is based on .Net?
closed as not constructive by Tetrad Feb 28 '12 at 6:28
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Photon Socket Server is a middleware provider which is using C++ as the underlying framework but the bulk of the logic (i.e. what you have access to) is using .NET.
Second Life runs (at least partially) using managed code. They run on MONO, which is a Linux port of .NET. It's possible they're just hosting .NET within C++ for the scripts, but they are running it at least partially.
Lord of the Rings Online's client uses .NET 1.1. Not sure about the server. I think Turbine's games (LotRO, DDO, Asheron's Call) use .NET.
I have no idea of the server side but the DDO client throws exceptions that look like .net when it crashes.
Vindictus server is fully written in .Net. Vindictus offers only one logical shard with hundreds of thousands of simultaneous users, which can be done via function and data distributed computing techniques.
I'm pretty sure that CCP Games uses some .NET components on their servers.