It catches viruses in files just like any other AV solution. Emails are files.
Not so.
While an E-mail is a file, a file with a virus ("virus.exe") is very different from a file with an E-mail that contains a virus ("D1234567.SMD"). In the first case, a standard AV program will catch it, in the second case, a standard AV program will normally not catch it.
Some of the caveats that come into play here are that [1] A standard AV program may catch a very small percentage of viruses in E-mail files or even a lot of them -- but there is no way to know how much it will catch, [2] A standard AV program will make it look like the E-mails "disappeared", with no easy way to track what happened to them (IE no notifications are sent out), [3] A standard AV program that does happen to see a virus in an .mbx file will delete the .mbx file, [4] A standard AV program won't know about mailserver vulnerabilities, so it won't be able to detect many future viruses.
The difference between the regular version and the enterprise version is that the enterprise version is specifically designed to intercept each email and scan it before it goes on to its final destination.
In other words, the enterprise version includes a mailserver AV program (and therefore is expected to catch all viruses in E-mail passing through the server), whereas the regular version does not include a mailserver AV program (and therefore is not expected to catch viruses in E-mail passing through the server).
-Scott
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