Exchange 2000 behind firewall

Assuming OWA is already set up. Just open port 80. Since you don't mention what Firewall you are using I believe you know how to configure your firewall.

OWA with EX2000 I think is a default install. Along with port 80 open and forwarded to your server you should also ensure port 25 is open as well to allow smtp traffic if you haven't already done so, then you can access the owa by htttp://server.domain.com/exchange. Should prompt for the AD username and password. User may have to enter mailbox name which would be there smtp address ie, first.last@domain.com.
HTH...

You have to buy Exchange enterprise
Then you set up an exchange server as a front end server in a DMZ which talks to the primary exchange server in the LAN. You have a router Firewall in front and behind
Then you have to find the document regarding the ports to open on each router
Otherwise, your server is open via port 80

You do NOT need the Enterprise version of Exchange. However, in addition to port 80 and 25 to be open and forwarded to your Exchange server (if using NAT), for authentication of users (i.e., they have to log in using their network user ID/password,which I assume would be the minimum security you would be using), you also have to enable the firewall/router to forward GRE packets, which are required for AD authentication. Hope this helps!

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