I canβt say that you are 100% sure, but I think yes, you can. There is nothing special about the .NET platform that should be hosted on IIS 5 β it's just ISAPI. For IIS.NET, this is just another ISAPI filter, so you don't care what kind of magic you do while you return some text from this call to it. But then again, I donβt know for sure that MVC (.NET 3.5) does an excellent job with IIS 5.1
From a security point of view, there are all sorts of reasons not to host on IIS 5.1, but if this is not a problem (and performance is not critical), then IIS 5 should be able to host .NET 3.5 applications.
Read about security issues if you plan to deploy on the Internet with IIS 5.1.
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