The folks at AV-Comparatives have done an interesting test. They took four of the AV products 
that they rate Advanced+ for effectiveness and compared the number of signature updates per week. Kaspersky Labs came out way on top with 150 updates per week on average over June and July 2006. ESET had 16, Symantec 7, McAfee 5. That jibes well with Kasperky’s reputation for being the first out the door with a new signature. But is that the best measure of a good AV product? Most enterprises would certainly prefer fewer updates so they can schedule testing in a reasonable timeframe.
The report from AV-Comparatives makes the argument that more frequent updates can lead to more false positives and corrected signatures in later releases. » Comparing corporate AV solutions | Threat Chaos | ZDNet.com
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