Follow these instructions to import your Yahoo! contacts into Postbox. This will work for any other email addresses that use the Yahoo!-powered email, like att.net and sbcglobal.net.

1. Login in to Yahoo! Email via the webmail interface (not in Postbox)
2. Click on the Contacts tab at the top
3. Click the Actions button, and select Export All...
4. Click the Export Now button next to Netscape/Thunderbird
5. Type in the code to verify you're not a robot
6. In Postbox go to File | Import | Address Books
7. Select Text File from the list of options
8. In the file picker, point Postbox at your yahoo_ab.ldif file in your Downloads folder
9. Click Finish