You can browse your address book contacts using Yahoo! Messenger:
Please Note: To locate a specific contact quickly, type a Yahoo! ID or name in the "Find" field. Click the "Clear" button to the right of the "Find" field to retrieve your entire address book again.
Where's the Contact Customer Care button? With so many improvements to Messenger since the version you're using (lots more features and reliability), we figured you're ready to move up. So get your upgrade and with the new version, rest assured if you have questions, you’ll find that friendly button on its help pages.