You have AV on the desktop so that covers files in/out on the server. However, if you have four or five of those sieves, all stacked inside of each other, then when you throw a handful of dirt in the top you're much less likely to get anything coming out of the bottom-most sieve. Anti-Virus on your workstations), or even two of'em if you also include a UTM, you'll catch most of the dirt, but a couple significant bits will fall through. Think of each Anti-Virus engine (whether it's the UTM, Exchange Store scanning, server disk scanning, etc) as a sieve with a fine mesh, and think of the viruses as a handful of dirt being tossed into the top of the sieve. I think the point is to have a "layered" approach to threat management. ![]() Things slip past UTMs occaisionally things slip past Anti-Virus software on workstations occaisionally every Anti-Virus engine will eventually let something through.
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