F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 162

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Real-time scanning scans messages in mailboxes and public folders for
viruses.
Scanning
Scan Only Messages
Created Within
Scan Timeout
File Type Recognition
Intelligent file type
recognition
Specify which messages are scanned with the
real time scanning, for example; Last hour, Last
day, Last week. Messages that have been
created before the specified time are not
scanned.
Specify how long to wait for the real time scan
result. After the specified time, the client that
tries to access the scanned message gets the
"virus scanning in progress" notificaion.
Select whether you want to use Intelligent File
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.