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Do I need an Exchange frontend and can I live without ISA?

Last Modified: 2012-05-05
Users want some kind of remote mail access. Have a D-Link DFL200 firewall with a DMZ port. A Win2k3 server is placed in DMZ and acts as Web/Ftp server. On the LAN we have a Win2k3 Exchange server.

Everything works fine.

How can I implement some kind of remote mail-access? OWA? HTTPS? RPC?
I'm a completely beginner in OWA, HTTPS, RPC so I need some step-by-step advices.

I have never used ISA so I would prefer a solution without ISA.

Do I have to install Exchange/OWA on the Web server in DMZ, or is it possible do make a secure solution against the Exchange server on the LAN. OWA works fine on the Exchange backend server for LAN users.
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