The email address book in Thunderbird is one of those that can’t be synchronized in Thunderbird directly. That is, until I found the extension SyncMab which synchronizes the address book at every startup and shutdown of Thunderbird by saving it as a file, or on a server using http, ftp and https protocols.

Up to four address books can be synchronized at a time. To work with SyncMab you first export the address book and save it on a network drive or on an Internet server and point the extension then to that file so that it pulls the address book from that location during startup and saves it again after closing down Thunderbird.

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Sync Mab Homepage