CalDav doesn't read server items from server

[bernd]

This is a very annoying bug in Korganizer and Kadressbook. My Emails, contacts and calendar entries are stored on a very reliable and secure German provider - mailbox.org. Kmail fetches emails from the server as it should. But my contacts and calendar events which are stored on mailbox.org will not be downloaded to korganizer. This has been described here, and I don't know why it takes so long so solve this problem.
https://bugs.kde.org/show_bug.cgi?id=325224

Maybe Maui Linux has a magic solution or influence on this issue 

Bernd