OWA in DMZ - HowTo

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I'm planning the deployment of the new messaging system in our company. The
Exchange 2003 ENT will reside in LAN. Many users need to access their
mailboxes using POP, IMAP and HTTP (OWA). In DMZ we have 2 W2K ADV (NLB).
The best solution would be installing OWA on the W2K servers in DMZ and
opening 2 ports needed for outside users to download mail via POP or IMAP.
But installing OWA on a stand-alone server (which does not have Exch) seems
to be impossible. So AFAIK the only solution is: install EXCH 2003
Front-end on both W2K ADV servers in DMZ.
The questions are:
- Is it confirmed that OWA cannot be installed on a stand-alone server?
- If installing front-end servers is the only solution, will I need 3
server licenses (2 for each front-end + 1 for the back-end server)?
- Considering this last configuration, may I install STD version of Exch on
front-end and ENT on back-end?

Thank you for any suggestions.
.



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