The advantage of multiple anti-virus engines on server products

 The Forefront server security products
provide several key security capabilities to Exchange and SharePoint
customers, including an advanced multiple anti-virus engine manager
that allows you to concurrently run up to 5 of the included Microsoft
and third-party anti-malware engines. Using multiple scan engines
delivers several critical advantages:
It increases the chances that emerging threats will be quickly caught. It
provides redundancy to help protect against scan failures or defects in
individual engines; if an engine fails, other engines continue scanning
messages.It
gives administrators an effective way to choose the most appropriate
level of protection for their environment given their security needs
and server performance capabilities.It allows engines to be taken offline for updates or reconfiguration without forcing messages to be queued.
A
recent set of tests performed by the independent AV-Test.org group
found some surprising differences in signature update times from
various vendors. The tests compared AV lab response times for
eighty-two “in the wild� viruses and variants. Twenty-six of the
viruses were quickly detected by all the scan engines, but some engines
didn’t detect viruses for more than twenty-four hours. In a few cases
(notably 0506 Banwarum.C@mm), some vendors didn’t update their
signatures to provide a block until nearly five days had elapsed!
Because Forefront Security for Exchange Server and Forefront Security for SharePoint
combine multiple engines, the odds that a virus will go unblocked or
undetected for long periods are greatly reduced. Organizations benefit
from all updates for the set of engines you use, not just from updates
to a single engine.check out the chart at source.For a larger version of this chart go here   
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