How to configure automatic synchronization of other GMX calendars with Mozilla Thunderbird

  1. Start Mozilla Firefox and enter the path https://caldav.gmx.com/your GMX e-mail address in the address line. Press Enter.
  2. Enter your GMX e-mail address and password.
  3. Click Home collection at the end of the page.
  4. Right-click the name of the calendar you want to synchronize with Thunderbird.
    A context menu opens.
  5. Select Copy Link Location in the context menu.
  6. Start Mozilla Thunderbird.
  7. Press Alt + D to open the Filemenu.
  8. In the New submenu, select Calendar.
  9. Select the On the Network option and then Next to continue.
  10. Select the CalDAV format.
  11. Click the Location field and press Str + V to paste the link address of the calendar from the clipboard.
  12. Click Next.
  13. Give the GMX Organizer a name and, if applicable, a color. Appointments from this calendar will later be displayed in the color. Select Next to continue.
  14. Complete setup by clicking Finish.
Postrequisite:

If you want to synchronize other GMX Organizers with Thunderbird, repeat steps 4 through 14.