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The Contact List, the most important part of Yahoo! Messenger, is a reflection of your Yahoo! Contacts. The list includes your Messenger List, which is where you place all of the contacts with whom you plan to instant message, and the Address Book group, which is where you’ll find all of your address book contacts who aren’t on your Messenger List. Combined, the Messenger List and Address Book group provide access to all of your Yahoo! Contacts. When you add a new contact to your Messenger List, you’re also adding the contact to your Yahoo! Contacts.

Even though Messenger is an application running on your computer, you have to sign in to use it. By signing in, you are connecting with your account on a Yahoo! server, and you have access to much of your account information, including your Yahoo! Contacts. So, the next time you’re away from home working on a different computer, you’ll still have access to all of your contacts, even those you added through Yahoo! Messenger. Does Yahoo! take care of you or what?
Learn more about the Contact List and how to work with it in the Working With the Contact List tutorial.