I'm trying to find out if other people are able to do this. I've found the following question and answer (which refers to Scott Hanselmans post on mixing Forms and MVC) (http://stackoverflow.com/questions/541703/can-i-use-asp-net-mvc-together-with-regular-asp-net-web-forms). However this is not quite the same.
Are you able to run a .NET FORMS project on a server (as rootproject) and at the same time have a MVC running on the same server (as subproject)? Just try empty default projects, it won't work :)
http://server (or http://www.server.com) --- FORMS PROJECT
http://server/mvc (or http://www.server.com/mvc) --- MVC PROJECT