Click on the menu icon in the top right corner of the
In the New submenu, select
Select the On the Network option and then
Next to continue.
Select the CalDAV format.
In the Location field, enter the path https://caldav.gmx.com/begenda/dav/your GMX e-mail
Example: For the e-mail address email@example.com, you enter https://firstname.lastname@example.org/calendar/ as the
Your GMX "My Calendar"
default calendar is now synchronized with Mozilla Thunderbird.
Give the GMX
Organizer a name and, if applicable, a color. Appointments
from this calendar will later be displayed in the color. Click
Enter your GMX e-mail address and password. Confirm by
Complete setup by clicking Finish.