Question : If OWA is using port 80 should i use another port to host my sites?

I'm going to be hosting websites on our 2003 server at work, ive been looking around the settings and i notice on our router (draytek 2800) that port 80 is already in use for OWA. should i use another port or can i still use 80. if i'm to use another one which one?

Answer : If OWA is using port 80 should i use another port to host my sites?

You can still use port 80. I have set this up so that OWA uses one domain name and the website uses another. Both have separate IP addresses in DNS, so there is no conflict.