It's easy to have both IIS and Apache servers running together at the same time on your local machine. Get IIS running first. Then set up Apache to Listen on a different port (in the httpd.conf file, find the Listen directive and change it to something like this):
You can also set up Apache to use the same DocumentRoot as IIS (I use c:\inetpub\wwwroot for both), so you can test scripts on both servers without having to move things around.
Use php_info() to verify the same script is called like this: