Learn how to add a list of holidays to your calendar in Thunderbird.
This article describes how to change the preferences (name, color, location etc.) of a single calendar.
This article describes the Lightning user interface. (Lightning is a popular calendar add-on for Thunderbird.)
This article describes how to configure the Lightning add-on for Thunderbird.
This article describes how to create a new event or task in the Lightning calendar add-on for Thunderbird.
This article describes how to export and share a calendar from the Lightning calendar add-on for Thunderbird.
This article describes how to change the date or time of an event.
If you need to set up a meeting, and keep track of who's attending and who is not, Lightning can do this as well as allow you to send invitations to people who do not have Thunderbird/Lightning, including Microsoft Outlook users!
This article describes how to create a recurring event in the Lightning calendar add-on for Thunderbird.
Using Thunderbird it's possible to have multiple calendars. You can connect to your online calendars during email account setup or create new calendars later.
How to configure Thunderbird/Lightning to send email invitations even if you're subscribed to a CalDAV calendar supporting serverside scheduling.
Common calendar update issues for Thunderbird with the Lightning add-on and recommendations to deal with them.
Detailed introduction to the most interesting new features, improvements, and changes visible to users in Thunderbird 91.0.