Firewall ports for OWA

What firewall ports need to be open for external Exchange 2010 OWA? We have a Fortinet firewall provided by Windstream. My users are able to access OWA internally on the network without issue. But no one is able to excess OWA externally. I would like to know what ports need to be added to the Foritnet firewall for OWA external access.
Melanie HowardComputer Support IAsked:
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timgreen7077Exchange EngineerCommented:
Microsoft recommends ports 80 and 443, but port 443 is really the only port needed.

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carlos sotoIT AdministratorCommented:
as @timgreen7077 says, 443 will suffice
Todd NelsonSystems EngineerCommented:
Regardless of Exchange version, HTTP (80) if you want insecure access and HTTPS (443) for secure access.  HTTPS is strongly recommended and the only port you should use for OWA.

Here are some port references as you may need them for future...
Todd NelsonSystems EngineerCommented:
Melanie, did you receive the information your requested?
timgreen7077Exchange EngineerCommented:
Todd the question was about ports being open for OWA and the answer was provided. Are we missing something here?
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