* Build some default contact providers - LDAP, OSX address book, Outlook, Google Contacts, Facebook, LinkedIn, SyncML connector, CardDAV connector, etc.
<b>6) Allow users to undo and redo changes to their contacts ([https://TODO:FEATUREPAGE wiki.mozilla.org/Features/Thunderbird/UndoRedo_in_Address_Book feature page]):</b>
* The current address book does not allow users to recover from mistakes with undo / redo. This is a source of frustration, and potential data loss if the user accidentally deletes a contact.