mmapes wrote:

Two rules won't work, because I want to move the message UNLESS the
sender is in EITHER of my address books. When I choose an "except"
clause, I only get one choice.

Three rules, then.

Apply this rule after the message arrives
sender is in "Address Book One"
and on this machine only
stop processing more rules

Apply this rule after the message arrives
sender is in "Address Book Two"
and on this machine only
stop processing more rules

Apply this rule after the message arrives
move it to "Who's This"

The first two rules will cause the message to remain in the Inbox if it is
in either the first contacts folder or the second conacts folder. The last
rule will move all remaining messages to the "Who's This" folder.
--
Brian Tillman [MVP-Outlook]