There's something wrong there, as our 7.6 version definitely catches mail from pop3 service. Recently one of my clients kept getting hit with about 20 different YAHA viruses from a single person.
I may be mistaken, as I don't have the system or the manuals in front of me, but in order to get mail coverage you still have to install the exchange mail part for it to work with any mail. Seems silly but I think that's it. It should be a regular part of NAV CE, you just have to configure it to be active.
HTH J.R. Juiliano
Information Systems Specialist
Tri-City Emergency Medical Group