Lightning is a small and popular plugin that adds a fully functional calendar to Mozilla Thunderbird's mail program. The new calendar features a unique intuitive and easy-to-read interface that integrates seamlessly with Mozilla Thunderbird's email client. In addition, the Lightning plug-in adds a new bar to the program, displaying the current date and informing about upcoming events.

Using this small program, we can also plan various events, as well as save important tasks in the calendar, which should be completed in due time. Simply select the appropriate day and then fill in the fields, entering the name of the event or task. In the program you will find useful filters to help you browse through saved events and other tasks.

In addition, the Lightning plug-in allows you to create and manage several calendars at the same time, and has a special function with which you can publish a calendar on an external web server.