change port in IIS SBS 2003

Hello,
I am trying to change the port used by IIS. This is primarily for OWA
and maybe RPC over HTTP. There is another Apache server that is
receiving port 80. I changed the port to 8080 in IIS for the default
website. I can get to http://ServerName:8080/, but when I try to get
to Exchange
http://ServerName:8080/exchange (right?), I get Internet Explorer
cannot display the webpage.
Same thing for RWW as well. I've tried different ports as well.
Any advice appreciated!