F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 8.00 Administrator's Manual page 241

Threat Detection
F-Secure Anti-Virus for Microsoft Exchange can identify spam and virus
outbreak patterns from messages.
Cache
VOD cache size
Class cache size
Administration with Web Console
Specify the maximum number of patterns to
cache for the virus outbreak detection service.
By default, the cache size is 10000 cached
patterns.
Specify the maximum number of patterns to
cache for spam detection service. By default, the
cache size is 10000 cached patterns.
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