Calendar and Date/Time

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Send Later Requires Restart Featured

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

Rated 5 out of 5 stars (149)
74,963 users

Provider for Exchange ActiveSync Requires Restart

Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync

Rated 5 out of 5 stars (5)
13,479 users

TbSync Requires Restart Featured

TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.

Rated 5 out of 5 stars (68)
24,692 users

Provider for CalDAV & CardDAV Requires Restart

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".

Rated 5 out of 5 stars (13)
12,150 users

Enhanced Date Formatter Requires Restart

Configure the 'Date' and 'Received' columns and displayed date in the message pane using custom formats. You can even use different date formats for emails with today's date, yesterday's date, dates in the last week, or dates older than a week.

Rated 5 out of 5 stars (10)
164 users

Show Calendar Week Requires Restart

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

Rated 5 out of 5 stars (6)
62 users

LCD Clock Requires Restart

displays a LCD Clock in your Toolbar

Rated 4 out of 5 stars (25)
36 users

Gantt View Requires Restart

Gantt Chart view for Sunbird/Lightning

Rated 4 out of 5 stars (32)
3,420 users

Todo.txt Requires Restart

Thunderbird extension for the Todo.txt application

Rated 4 out of 5 stars (9)
650 users

EDS Calendar Integration Requires Restart

Integrates calendars events with Gnome clock applet

Rated 4 out of 5 stars (11)
683 users

AdvancedTasks Requires Restart

Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.

Rated 4 out of 5 stars (7)
1,246 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This addon is now integrated into the new address book CardBook and thus it is no longer maintained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)
19 users

Open Google Calendar

Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)

Rated 4 out of 5 stars (32)
18,610 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 (19)
78 users

Lightning Calendar Tabs Requires Restart

Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.

Rated 4 out of 5 stars (13)
21,714 users

More Snooze Requires Restart

This add allow to customize the snooze delay when snooze popup appears (lightning required).

Rated 5 out of 5 stars (5)
730 users

SanRockstar Requires Restart

Music

Rated 5 out of 5 stars (3)
1 user

Purge Events Plus Requires Restart

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

Rated 4 out of 5 stars (7)
381 users

G-Hub Lite

Add Google Tabs to Thunderbird! Services supported by G-Hub Lite: Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need G Suite / Google Apps support? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (14)
5,383 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)
16 users