I was attempting to get this to work, but I just keep putting in my credentials @yahoo.com and nothing happens. Then I looked it up in Help and got a very confusing description: The article is titled: "Synchronizing with Yahoo! Address Book" You can synchronize your address book on your Mac with your Yahoo! address book. You use Address Book to specify that you want to synchronize with Yahoo! and then use .Mac to specify when and what to synchronize. So you have to be a .Mac member to use synchronization with Yahoo! That really does not make sense... Any help?