Nice to hear from you again Tom, been a few years. Yes we are still doing well, mainly focusing on ASP.NET Hosting Solutions these days as the core of the business.
There is not a .NET version but ASP.NET and Classic ASP can run on the same site as use this type of hybrid site all the time. Our own sites used ASP.NET 3.5, Classic ASP, and PHP all on the same site.
You can not pass sessions between ASP.NET, ASP, and PHP but there are way around this such as using server side objects to POST to pages and then parse the response.
You can do this with Web Wiz Forums using the HTTP XML API. You simply call the API from your ASP.NET, ASP, or PHP code and then parse the returned XML. The page below has more:-
There are not any plans at the time for an ASP.NET version of Web Wiz Forums as simply do not have 3 to 4 years development time or money to re-write the entire code base and to the same standard and stability of the present Classic ASP version.