Although I get an error message when the add-on runs telling me that the nokia pc-suite phone book adapter-library is not found.  When I continue anyway it all works fine.  Tried several times, deleted contacts from both phone and thunderbird, and each time it recognised the changes and offered to sync them.

I'd like to thank you for doing this, I tried to do the same thing using the Nokia PC Sync with Windows Address Book populed from a manual export from Thunderbird and it was heavy going.  This is so much better and worked first time - even the default behaviours are sensible.

By the way there's a message that pops up before you sync saying click OK to start the sync (or something similar) - the label on the button is actually GO ;-)

Thanks again

Steve