F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 210

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Step 3. Specify Virus Scanning Options
Choose how mailboxes and public folders are scanned for viruses during
the scheduled operation.
Scan messages for
viruses
Heuristic Scanning
Enable or disable the virus scan. The virus scan
scans messages for viruses and other malicious
code.
If you disable the virus scan, grayware scanning
and archive processing are disabled as well.
Enable or disable the heuristic scanning. The
heuristic scanning analyzes files for suspicious
code behavior so that the product can detect
unknown malware.
Heuristic scanning may affect the product
performance and increase the risk of false
malware alarms.