Calendar and Date/Time

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OBM Connector Requires Restart

OBM Lightning Calendar and addressbooks connector

Not yet rated
1,153 users

Send Later Requires Restart

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

Rated 5 out of 5 stars (80)
69,606 users

LCD Clock Requires Restart

displays a LCD Clock in your Toolbar

Rated 5 out of 5 stars (13)
2,777 users

Lightning Requires Restart

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 (1,831)
6,094,314 users

Reply Monitor Requires Restart

**This is NOT COMPATIBLE with Thunderbird 31 or newer versions**
Keep track of your emails and replies (Lightning is required).
Note: the name of this add-on has been changed to Reply Monitor because the previous name is a registered trademark.

Rated 4 out of 5 stars (17)
1,484 users

Todo.txt Extension Requires Restart

Thunderbird extension for the Todo.txt application

Rated 4 out of 5 stars (5)
559 users

Copy Reminder List To Clipboard

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

Not yet rated
56 users

SanRockstar Requires Restart

Music

Rated 5 out of 5 stars (3)
33 users

StormCows Requires Restart

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

Rated 4 out of 5 stars (10)
331 users

Zonio Freebusy for Lightning Requires Restart

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
29 users

MiniWebView Sidebar Requires Restart

Sidebar that shows a single web page. This allows Thunderbird to be augmented with any user-supplied or third-party web page. The screenshot shows an example - I use my own custom web page to present my Google Calendar in my preferred format.

Rated 5 out of 5 stars (4)
68 users

Task Me (activity logger) Requires Restart

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 (3)
148 users

ConferenceCall.nl templates

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

Not yet rated
10 users

DM Sync Requires Restart

This plugin allows you to synchronize addressbooks and contacts stored on the DM mail server

Not yet rated
11 users

Telefonkonferenz.de-Vorlagen

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

Not yet rated
18 users

Macro Template

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (1)
382 users

ConferenceCall.co.uk templates

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

Not yet rated
23 users

EDS Calendar Integration Requires Restart

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 (9)
511 users

Lightning Invitation Notifier Requires Restart

This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.

Rated 3 out of 5 stars (1)
745 users

MultiBirthdaysReminder Requires Restart

This addon is now integrated into the new address book CardBook and thus it is no longer maintained

Rated 5 out of 5 stars (6)
455 users