Lightning Calendar

Organize your life — it’s about time!

Organize your schedule and life’s important events in a calendar that’s fully integrated with your Thunderbird or Seamonkey email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Compatibility Information Thunderbird, Seamonkey, what version?
Get Support Need help with Lightning?
Holiday Calendars Need a break? Now you know when!
Developer Tools Dive into development.
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Bugs Ahoy! Want to make a difference? Fix a bug that fits your interests.