If you click on address book then click on help then click on Overview you get.
Overview
Introduction
The Address Book provides a convenient method and place to store contact information for easy retrieval and use. Depending on how your administrator has set up the system it can provide a private address book as well as access to public network directory services. It also supports distribution lists so you can create your own "mailing lists."
How do I do:
create your own "mailing lists."
OK, using your My Address Book, either do a search for your names or click on browse. When your names come up, you have an option at the top and bottom of the list that says "Add to a contact list", click on the down arrow and see "Create a new contact list in:" Underneath that you have My Address Book. Highlight that, then click add. Enter a contact list name. Now, place checks on your contact entries, and in the add column, scroll down to your new contact list, and check add. Your new contact is now also part of your new contact list.
John