Lightning Thunderbird add-on and restart Thunderbird.
Press Alt + D to open the
New submenu, select
On the Network option and then
Next to continue.
In the Location field, enter the path https://caldav.mail.com/begenda/dav/(your mail.com e-mail
Example: For the e-mail address email@example.com, you enter https://firstname.lastname@example.org/calendar/ as the
Calendar" default calendar is now synchronized with Mozilla Thunderbird.
Organizer a name and, if applicable, a
color. Appointments from this calendar will later be displayed in the color.
Enter your mail.com e-mail address and password. Confirm by
Complete setup by clicking