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.
Aggiunge vari strumenti per l'esportazione e l'importazione di cartelle e messaggi
Allows bidirectional access to Google Calendar
Allows several tweaks to the Thunderbird/Lightning calendar user interface including new selection styles and repeating event icons. Mimics the colors and styles found in MS Outlook.
This addon adds month tabs into Lightning calendar month view
SyncKolab can synchronize your calendar, address book and tasks against an IMAP server in Kolab formats version 1 (vCard/iCal) or version 2 (XML) or turn your Thunderbird/Lightning into a native Kolab Client (http://kolab.org).
Tasks and emails management in a Thunderbird extension. tasks are stored in emails folder and it's possible to link an email to a task.
See all in one, emails and tasks (no more pain to synchronize a task manager).
ToodledoSync is an extension that I've done to fill my need of a GTD system using Thunderbird and Toodledo. It allows to easily convert mails to toodledo tasks, addind all usefull fields to the mail compose window.