Calendar and Date/Time

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Send Later

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

Rated 4 out of 5 stars (46)
42,113 users

More Snooze

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

Rated 5 out of 5 stars (4)
1,539 users

Reply Monitor

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 (12)
888 users

StormCows

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

Rated 4 out of 5 stars (9)
546 users

Lightning Calendar Tabs

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 (6)
27,071 users

Montezooma

Montezooma is a Thunderbird Addon that adds zooming functionality to windows.

Rated 4 out of 5 stars (6)
1,073 users

G-Hub Lite

Adds Google Tabs to Thunderbird. Services include Voice, Calendar, Drive (Docs), Contacts, Groups, News, Books, Play, Maps, Sites, Finance, Picasa, Plus. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 3 out of 5 stars (16)
3,207 users

SanRockstar

Music

Rated 5 out of 5 stars (1)
71 users

Macro Template No Restart

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

Rated 5 out of 5 stars (1)
103 users

Event-extract

Helps to add emails more easily to your calendar. Suggests date and time information based on email content when converting to an event or a task. Depends on Lightning addon for calendaring.

Rated 3 out of 5 stars (6)
612 users

MiniWebView Sidebar

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 4 out of 5 stars (1)
50 users

DM Sync

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

Not yet rated
21 users

OBM Connector

OBM Lightning Calendar and addressbooks connector

Not yet rated
235 users