How did you move your Thunderbird data from its default position? If you had simply shifted your entire profile, the address book files would have moved too, so I suspect you've used the dangerous and inadvisable "Local Directory" option in Account Settinhgs to relocate specific mailstore files. :-( I don't know of any way to set the path for address books. They are, it seems, required by design to reside in the user profile folder. I don't like to advise use of the Local Directory settings, since doing so detaches message stores from your profile and makes profile management and maintenance a whole lot more difficult. Automated tools such as Mozbackup won't know to look outside the regular profile to safeguard your messages. All the published advice about profile management assumes you use the default locations which are within the profile. The Local Directory setting should, IMHO, be hidden inside the about:config editor for use only by power users.