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I have a single domain, single Exchange 2000 server running Active Directory in native mode. I want to make Outlook Web Access available to my users via the Internet. What security should I use to make sure my exposure to the outside is not compromised on my Exchange server?
The single best thing you can do is implement Secure Sockets Layer (SSL) for OWA access. If you do this, user data, including their logon in OWA, will be encrypted. Typically, to ensure every user access, you end up making authentication basic, which means clear text -- not a good idea on any network. By adding SSL you protect logon and data transfer. In addition you need to train users in sound security practices. They need to take special precautions when using public sites for e-mail like deleting Internet files, logging off, closing the browser and such.