Calendar and Date/Time

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Zonio Freebusy for Lightning

Finds when are people available for a meeting or event via Zonio Freebusy service. Displays freebusy blocks instantly in Invite Attendees window while attendees are being added. Works with both local calendar storage or any calendar provider.

Not yet rated
6 users
Updated July 27, 2016

Todo.txt Extension

Thunderbird extension for the Todo.txt application

Rated 4 out of 5 stars (5)
388 users
Updated July 22, 2016

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (69)
61,168 users
Updated July 21, 2016

ConferenceCall.nl templates No Restart

Voegt de handige e-mail templates toe aan de knoppenbalk van Thunderbird om deelnemers aan uw conference call uit te nodigen.

Not yet rated
3 users
Updated June 21, 2016

Telefonkonferenz.de-Vorlagen No Restart

Durch das Plug-in werden unsere praktischen E-Mail-Vorlagen Ihrer Thunderbird-Symbolleiste hinzugefügt

Not yet rated
4 users
Updated June 20, 2016

ConferenceCall.co.uk templates No Restart

This plugin adds our savvy email templates to your Thunderbird toolbar.

Not yet rated
11 users
Updated June 20, 2016

NoiaButtons No Restart

The 'NoiaButtons' add-on offers cartoonish toolbar button icons (known from Noia themes) for default theme and lightweight themes. Further more lite silver and dark versions of Noia themes are included.

Rated 5 out of 5 stars (14)
14,922 users
Updated June 17, 2016

Task Me (activity logger)

Activity logger (sampled task monitoring) which uses calendar to store user's activities.

It periodically displays window with textbox where user can put description of currently performed tasks. The description is saved in a calendar.

Rated 4 out of 5 stars (2)
57 users
Updated June 15, 2016

Show Calendar Week

Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.

Rated 5 out of 5 stars (6)
2,367 users
Updated May 4, 2016

Lightning Featured

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

Rated 3 out of 5 stars (1,918)
5,506,385 users
Updated April 25, 2016

EDS Calendar Integration

Integrates calendars events with Gnome clock applet

IMPORTANT:
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.

Rated 4 out of 5 stars (7)
345 users
Updated March 21, 2016

G-Hub Lite

Add Google Tabs to Thunderbird! Services supported: Voice, Calendar, Drive, Docs, Sheets, Slides, Hangouts, Plus, Photos, Contacts, News, Maps, & many more. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (3)
3,437 users
Updated November 23, 2015

NirvanaHQ

NirvanaHQ for Thunderbird

Not yet rated
10 users
Updated October 26, 2015

Lightning Colors Reminder

Let's show the calendar color on Lightning reminders!

Not yet rated
3,642 users
Updated October 23, 2015

OBM Connector

OBM Lightning Calendar and addressbooks connector

Not yet rated
763 users
Updated September 25, 2015

StormCows

Allows two-way access between Remember The Milk and calendar events or todo items.

Rated 4 out of 5 stars (10)
372 users
Updated September 13, 2015

MultiBirthdaysReminder

This addon is now integrated into the new address book CardBook : https://addons.mozilla.org/thunderbird/addon/cardbook/ (and thus it is no longer maintained)

Rated 5 out of 5 stars (6)
417 users
Updated September 9, 2015

Copy Reminder List To Clipboard No Restart

Provides button to copy the list of current reminders to the clipboard.

Not yet rated
53 users
Updated September 2, 2015

Lightning Reminder Left Buttons

Tired to mistakenly press that "Dismiss All" button? Move the Lightining Reminder "Snooze all for" and "Dismiss All" buttons to the LEFT!
... and from version 2.0 you can keep them on the RIGHT, but swapped!

Rated 4 out of 5 stars (1)
909 users
Updated July 18, 2015

Purge Events Plus

Purge events from Sunbird and Lightning files and thereby cleanes the calendar

Rated 4 out of 5 stars (9)
1,130 users
Updated July 2, 2015