Documented the addressbook:// URL scheme.

Updated for OS X v10.8.

Minor editorial changes throughout.

Updated the sections Using the People Picker, Searching an Address Book, Using Address Book Groups as Distribution Lists, and Creating and Using Address Book Action Plug-in. Added sample code to Adding Properties to Address Book Records. Formatting and editorial changes throughout.

Minor changes throughout.

Made minor updates to searching and drag-and-drop exporting.

Made minor editorial corrections throughout.

Made minor sample code changes. Added important note about syncing with Sync Services to the introduction.

Added major updates. New sections include Creating and Using Address Book Action Plug-ins, Using the People Picker, and Using the Address Book C API for Carbon developers. Other sections have new sample code and more detailed content.

Made minor correction in Search Examples.

Added revision history, which records changes to the content of Address Book.