AppleScript Central (.com)

This script will add the senders or recipients of selected messages in a folder — or automatically of messages filtered by a rule — to an Entourage Group you choose. It can also enter the members in the Address Book if desired, set set category of the messages and/or these contacts to that of the group, and automatically make new groups if and when the number of group members reaches the limit set by your ISP for multiple recipients. (Script ID: 354)