The Sogo Connector add-on by Inverse works OK if I add contact info via Thunderbird locally. But, if I step out for lunch and add a contact using my phone, after lunch to refresh the email addressbook data in Thunderbird it is necessary to shut down the app and relaunch it. Perhaps fruux could work with Inverse to make this data update happen automatically. Or, if not, at least have them put a button in the Thunderbird Add-on Manager so addressbook data can be resynced manually.