Theory, you can have both, but practically, they might conflict in some ways. w/ any wamp package, including this wampserver suite, you can install add-on such asp.net, jsp w/ tomcat, so on. Of course, I do know asp.net differ from asp, but they have a saying "you can't eat a cookie and have it the same time". Anyway, if you still like to try it, make sure to test on single unit before put on main server, and here is the simplest way as far as I know
1. Configure iis running as service
2. Stop iis
3. Install wampserver w/ option running as service
4. Open httpd.conf in wamp/apache2/conf
5. Find and change listen 80 to other port such as 81, 8080, so on
6. Enable associated port 81, 8080, so on for wampserver in all firewalls and routers
7. Restart your computer, and now you have both iis and wampserver running
Have fun
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