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Yet another "Ports for OWA" question...

I know it has been covered in several different places, by several different people, but I want to confirm some information about Outlook Web Access.  We have an SBS 2003 Server that is used as file/print server, and is behind a PIX managed outside our network by Corp HQ.  I have NO ports open, so I use this server for internal mail and as a "storage" location for email, contacts, etc information.  All clients have a POP3 account that comes directly into their outlook on the local machines, and the email is then stored in their Mailbox on the exchange server.  I am needing to enable ONLY Outlook Web Access so someone can use their HTC Touch (PDA) to access their mail outside the network.

My question is this: Do I only need port 443?  Unfortunately, they charge per port opened, and I've seen some responsed detailing several ports, while others detail only 443 or 443 and 25.  

1 Solution
If you are having them connect to OWA using SSL then only port 443 if you are having them connect non-SSL then they only need port 80 (http) port 25 is only for SMTP and that is only used if you need them to be able to send outgoing mail through the exchange server. Otherwise they can send mail internally to the exchange server with only port 443 or port 80 depending on if you are using SSL or not.
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