OWA access and security

There is now a need for going to work with Outlook Web Access on our company.
What I first like to know is what port(s) does OWA needs to access from
outside?
If I want to give our employees a save way to use this, what are the safety
issues, e.g. do we need SSL etc. ?

We have a SBS2003 Premium Server with two NIC's. One for the internal
network, on the other NIC the e-mail from outside is delivered. This NIC is
connected to a external router and firewall and for this NIC only port 25 is
open. We do not use ISA.

Is it save to open the required ports on the firewall, to give employees
access?

Thanks in advance,

Gerko
.

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