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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://www.gfi.com/whitepapers/why-one-virus-engine-is-not-enough.pdf" target="_top">Why one virus engine is not enough</a> - This white paper explains the importance of response time, shows the response time differences between virus engines, and explains why having multiple scanners at mail server level decreases the average response time and therefore the chance of virus infection.