Can IIS Express run side-by-side with other Web servers?
Yes, IIS Express can run side-by-side with other Web servers as long as there are no conflicting bindings. You can run IIS Express and the operating system version of IIS (IIS 5.1 on Windows XP, IIS 6.0 on Windows Server 2003, IIS 7.0 on Windows Server 2008 or Windows Vista, IIS 7.5 on Windows Server 2008 R2 or Windows 7). IIS Express comes with a default website that runs on port 8080 to avoid conflicts with IIS, which uses port 80 by default. A binding conflict will occur if IIS Express and the other Web server both try to listen on port 80.