This collection is aimed at computer professionals that use Thunderbird as their main communication, networking, and scheduling software.
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.
Collector's Note A calendar that can be used to invite attendees via email. Optionally configurable with various providers.
Allows bidirectional access to Google Calendar
Collector's Note Allows use of Google Calendar with Lightning.
Minimizes windows into the system tray.
Collector's Note Thunderbird stays in tray when minimized.
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Access to Google contacts and synchronize them with Thunderbird address books.
This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.
True "Send Later" functionality to schedule the time for sending an email.
Collector's Note Wrote an email at 3am? Send it at 8am as you sleep soundly. A lot of people judge.
Allow to redirect (a.k.a. "bounce") mail messages to other recipients.
Add Dropbox support to Thunderbird's Filelink feature.
Collector's Note Use Dropbox with Thunderbird for sending large files.
The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.
Displays icon for user agent of received mails.
Collector's Note See what device sender was using in email.
Keep your menus in check by filtering out items you never use.
Ever sent mail from the wrong email address because you forgot to select the correct identity in the compose window?
Collector's Note Simplify use of email aliases.
This is a Thunderbird addon that lets you customize the behavior of the IMAP draft unread messages. No more new mail notifications for your drafts!!
This add-on is a button on your toolbar that lets you open web apps as Tabs in Thunderbird. Use it to load Google Mail, Google Wave, Google Voice, and other "inboxes" (or any url) as tabs within Thunderbird, making it your communications hub.
Collector's Note I like to open up a Google Voice tab with this.