F-SECURE ANTI-VIRUS FOR MICROSOFT EXCHANGE 7.10 Administrator's Manual page 66

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Sandbox Scanning
The sandbox scan emulates and analyzes the code in a safe and isolated
environment.
Proactive Virus Threat Detection
The proactive virus threat detection analyzes e-mail messages for
possible virus patterns and security threats. All possibly harmful
messages are quarantined as unsafe. The proactive virus threat detection
can detect new viruses during the first minutes of the outbreak.
Grayware Scanning
The grayware scan detects applications that have annoying or
undesirable behavior that can reduce the performance of computers on
the network and introduce significant security risks to your organization.
Grayware includes spyware, adware, dialers, joke programs, remote
access tools, and any other unwelcome files and programs that can
perform a variety of undesired and threatening actions, such as irritating
users with pop-up windows, logging user key strokes, and exposing the
computer to vulnerabilities.