Wolf, part of why this bug was closed is because you have combined several different issues into one bug, which makes it difficult for the bug to be triaged and for a developer to fix issues.
Could you try to split this bug into separate bugs? Calendar support is different than Contacts support. And IMAP seems something different too.
As a workaround, install Evolution.
Run Evolution.
Open Edit > Accounts.
Click the dropdown arrow next to New. Click either Address Book or Calendar.
Click the Type dropdown and choose either CalDAV or CardDAV.
Finish entering your account details.
Wolf, part of why this bug was closed is because you have combined several different issues into one bug, which makes it difficult for the bug to be triaged and for a developer to fix issues.
Could you try to split this bug into separate bugs? Calendar support is different than Contacts support. And IMAP seems something different too.
As a workaround, install Evolution.
Run Evolution.
Open Edit > Accounts.
Click the dropdown arrow next to New. Click either Address Book or Calendar.
Click the Type dropdown and choose either CalDAV or CardDAV.
Finish entering your account details.