I'm working on a website with legacy Classic ASP pages (being converted to ASP.NET on an as needed basis) and new ASP.NET pages. Use of IIS 7 Integrated Pipeline has been very helpful with our configuration. For example, we were able to get forms authentication working auto-magically with the classic ASP pages simply by configuring the appropriate sections of the web.config file (i.e. no changes were required to the Classic ASP pages, for more info see I'm working on a website with legacy Classic AS