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I have two problems with card book
does It need VPN to sync! In Iran?
Editing note of a contact, duplicate the contact!

Questa recensione riguarda una versione precedente (83.6) del componente aggiuntivo. 

no need of a VPN, sync is done like you access to internet...
I've not understood the other issue... do not hesitate to contact me directly here : cardbook.thunderbird(at) gmail.com. Greetings to iranian people and wish you the best for 2023 ;) !