Info:
Calendar functionality was integrated into Thunderbird with version 78.0. If
you don't see any options to add or view a calendar, please make sure to update
Thunderbird to the latest version.
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Click on the menu icon in the top right corner of the
Thunderbird window.
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In the New submenu, select
Calendar.
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Select the On the Network option and then
Next to continue.
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In the User name field, enter your GMX address.
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In the Location field, enter the path https://caldav.gmx.com/begenda/dav/your GMX email
address/calendar.
Example: For the email address john.doe@gmx.com, you enter https://caldav.gmx.com/begenda/dav/john.doe@gmx.com/calendar/ as the
location.
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Click Find Calendars.
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Enter the password for your GMX
Account and click on Sign in.
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Under Calendar Type choose CalDAV.
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Under Properties give the GMX
Organizer a name and, if applicable, a color. Appointments
from this calendar will later be displayed in the color. Click
Subscribe.
Your GMX "My Calendar"
default calendar is now synchronized with Mozilla Thunderbird.
