Blocked ports? - OWA Exchange 2003 not working from one location

I have an Exchange 2003 with OWA running.  Users can access it easily from most places.  There is one location, from which our users cannot access OWA.  They have internet access and can open webpages in general but not my OWA.

I suspect they are blocking some ports in their network firewall configuration, and I would like  to ask their IT guys,  but I don't know which ports are required for OWA or what port(s) they might be blocking.

TIA  Naomi
NaomiGAsked:
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ColinRoydsConnect With a Mentor Commented:
they need to open either port 80 for http, or port 443 for ssl (https) if you are using it

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