I tried to set up OXtender for thunderbird (version However thunderbirds status line displays the error message "Unbekannter-Open-Xchange Server".

When I run the system check it says: "System check failed".

The server settings should be correct (I tried exactly the same in outlooks OXTender and it worked).

I tried to set "calendar.useragen.extra" from "Lightning/2.6.4" to "" as it is suggested (https://forum.open-xchange.com/showt...nge-einrichten) but without success.

Can some help?