ONE MORE TIME "BACK TO THE PAST"

Always the same bug and it seems nobody from MOZILlA is able to troubleshoot. When I open Thunderbird, the following panel appears. I cannot delete it. --------------------------------------------------------------- Authentification require -Mozilla Thunderbird" https://caldav.gmx.com ask for a user name and a password. --------------------------------------------------------------- I never create this account Regards Marc [redacted] @gmx.com