F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 179

Virus Scanning
Specify messages and attachments that should be scanned for malicious
code during the manual scan.
Scan messages for
viruses
Heuristic Scanning
Administration with Web Console
Enable or disable the virus scan. The virus scan
scans messages for viruses and other malicious
code.
Enable or disable the heuristic scanning. The
heuristic scan analyzes files for suspicious code
behavior so that the product can detect unknown
malware.
The heuristic scan may affect the product
performance and increase the risk of false
malware alarms.
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