Thunderbird recently got native support for carddav. Thats great! I used so far cardbook, which works well, but doesnt fully integrate. My email-provider is zoho. Synchronisation of calendars works fine. Addressbooks only synchronise via cardbook. Im able ton establish the connection to https://contacts.zoho.eu/... but the existing contacts are not displayed. Its possible to enter new contacts, which are remotely stored by zoho, but after synchronisation, they disappear in the native adressbook, but are still present remotely. Kind of oneway. zoho writes, one have to use the SOGo-addon https://www.sogo.nu/download.html#/frontends, but that didnt work either. Any ideas why it works with cardbook but not with the native adressbook?