Calendar and Date/Time
DM Sync Requires Restart
This plugin allows you to synchronize addressbooks and contacts stored on the DM mail server
Durch das Plug-in werden unsere praktischen E-Mail-Vorlagen Ihrer Thunderbird-Symbolleiste hinzugefügt
Macro Template is to replace mail templates with macros for date formatting.
This plugin adds our savvy email templates to your Thunderbird toolbar.
EDS Calendar Integration Requires Restart
Integrates calendars events with Gnome clock applet
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.
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.
MultiBirthdaysReminder Requires Restart
This addon is now integrated into the new address book CardBook and thus it is no longer maintained
lightningWeather Requires Restart
LightningWeather shows the weather forecast in the background of the calendar so you can easily coordinate your activities with the weather.
Date on Thunderbird Requires Restart
Simple Week View Requires Restart
A simple week view for Lightning, as in the print layout.
Montezooma Requires Restart
Montezooma is a Thunderbird Addon that adds zooming functionality to windows.
NirvanaHQ Requires Restart
NirvanaHQ for Thunderbird
Todo.txt Extension Requires Restart
Thunderbird extension for the Todo.txt application
Provides button to copy the list of current reminders to the clipboard.
SanRockstar Requires Restart
StormCows Requires Restart
Allows two-way access between Remember The Milk and calendar events or todo items.
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.
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.
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.