McAfee OFFICE 3.1 User Manual page 143

It is really important to choose a password that others will not guess.
Choosing words, such as "open sesame" is a poor choice because there are
password guessing programs that systematically try every word in the
dictionary as well as common phrases, names, dates and other predicatable
entries. It is better to choose several unrelated words, letters mixed with
numbers, or completely random characters. The more, the better. There are
password generation programs that can help you choose. They may help.
It is better to use a new password every time you make an important
configuration change. Every file you create with a password is "valid" in that
McAfee Firewall will see that it matches the password you used for it. Using a
new password prevents someone from secretly replacing an older
configuration file for a newer one.
Trojans such as BO and Netbus can log keyboard stokes. Therefore, they can
log a password as you type it. While McAfee Firewall helps you detect trojans,
you must be diligent in keeping them off your computer(s) before they
compromise the security systems you put in place.
TIP: It is also good to have an anti-virus system such as McAfee
VirusScan installed on your computer to ensure protection from Trojans
and other known viruses.
McAfee Firewall
User's Guide 143