F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 164

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Enable background Enable or disable background scanning.
scanning
Scan only messages Specify whether to scan all messages or only
with attachments messages with attachments. When the setting is
Enabled, only messages that contain
attachments are scanned on background
scanning.
Scan only Specify whether to scan all messages or only
unprocessed messages that have not been processed yet.
messages When the setting is Enabled, only unprocessed
messages are scanned on background
scanning.
Scan only messages Specify which messages are scanned on the
created within background scanning, for example; Last hour,
Last day, Last week. Messages that have been
received before the specified time are not
scanned.
File Type Recognition
Intelligent file type Select whether you want to use Intelligent File
recognition Type Recognition or not.
Trojans and other malicious code can disguise
themselves with filename extensions which are
usually considered safe to use. Intelligent File
Type Recognition can recognize the real file type
of the message attachment and use that while
the attachment is processed.
Using Intelligent File Type Recognition
strengthens the security but can degrade the
system performance.