Just recently, my emClient (8.2.1473 (04b618f)) seems to have lost MyCalendar – it only provides the Local Calendar.
Synchronizing with my internet calendar (GMX / CalDAV) and my Android calendar (therefore) is not possible.
Re-setting the IMAP-account has not solved the issue.
I would suggest then as you have already removed and re-added your IMAP account and the Calendar on the server online appears ok, Sounds like then either a problem with database itself somewhere, or eM Client program itself.
If you have recently make a backup of eM Client (when the calendar was working), try restoring via “Menu / File / Restore” using the Windows version to see if that fixes it. Before restoring make a backup via “Menu / Backup”.
If you have no backup or restoring made no difference to the problem, then try uninstalling eM Client and “don’t delete the database on uninstall”. Then d/l the same version from the ver history page and reinstall. eM Client will pickup your exiting database and hopefully the calendar will start working if it was program related. https://www.emclient.com/release-history
Since I had no backup to solve the problem I uninstalled eM Client without deleting the database. Re-installing the same version did not succeed since for whatever reason my database had been re-configured by a later version. Moreover, the installer interrupted for adding a more recent version than I was about to install.
In any case, the calendar still does not provide the “MyCalendar” folder.
Ah ok. I had thought you had (already removed your IMAP account) as per your initial post at the top Quote - "Re-setting the IMAP-account has not solved the issue, but i see you haven’t from your last reply.
As @Gary says that will normally fix any issue like that. So hopefully that fixes the problem.
Therefore - and as a summary of the error-reporting:
Access to GMX-Mail and GMX-Contacts/Adresses works fine.
Access to GMX-Calendar does not and is only local.
If you are on the Windows Insider program, or using Windows 11, there may be some issues. I installed Windows 11 (22000.51), and CalDAV fails because of some Microsoft bug. You will need to give them some time to work it out.