[Zope] using zope behind IIS?--help with IS dept.

Hi, I am running zope 2.5 with the Zope server for my intranet. The company web (public) server is windows/IIS5. I want to use my zope server to provide some pages for the public on my zope server. Problem: IIS needs a physical folder to create a virtual directory in IIS. Zope does not have Windows directories that coincide with the folders that IIS/Windows needs. My IS department does not want to make my Zope server totally open on port 80 (because there are other internal items there as well). How can I securely serve a portion of my zope site within a windows/IIS network that does not require my entire internal/zope server to be totally accessible to everyone?