How to access Yahoo address book from Mac Address Book app or Mac Mail...?

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Hi folks,

Mac OS X 10.6.8 Snow Leopard
Address book v. 5.0.3
Mail v. 4.6 (1085)...

I created a mailbox for my Yahoo mail account. I can read email, reply to senders, delete mail from folders, etc.

I cannot access my account's address book. I cannot seem to find a way to configure access to my Yahoo address book either from "Mail" or from the "Address Book" app itself.

I am using a Mac at work
Mac OS X 10.7.5
Address Book v. 6.1.3
Mail v. 5.3

and it works fine. My Yahoo address book is known to Mail and I didn't have to explicitly set up anything in "Mail" nor in "Address Book."

Can someone point me to the right "Preferences..." option or other mechanism?

Thanks in advance,