[Mimedefang] New .zip virus?

[Kevin A. McGrail]

> It's actually the definitions a virus scanner has, rather than the
> utilities that use them, that normally matter. Someone may be using an
> older version of a commandline tool that doesn't support certain options
> but it may (assuming the tool <-> library/definitions api is stable
enough)
> be able to use the latest virus defs.

In regards to McAfee and NAV, we always recommend replacing the engine and
the defs whenever a new version is available.  I don't disagree that people
might be running older engine files but doing so is a risky proposition in
our opinion.

KAM