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LookOut (fix version) Requires Restart

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).
Support: Thunderbird and SeaMonkey

Rated 4 out of 5 stars (29)
101,045 users

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird and Google Contacts.

Rated 4 out of 5 stars (280)
90,109 users

CardBook Requires Restart Featured

A new Thunderbird address book based on the CardDAV and vCard standards.

Twitter: @CardBookAddon

Rated 4 out of 5 stars (196)
45,734 users

Addressbooks Synchronizer Requires Restart

Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers

Rated 4 out of 5 stars (59)
33,230 users

LookOut Requires Restart

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).

Rated 4 out of 5 stars (156)
26,294 users

ExQuilla for Exchange Requires Restart

Thunderbird email accounts connecting to Microsoft Exchange Web Services.

Rated 3 out of 5 stars (114)
23,092 users

TbSync

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 (54)
18,934 users

Contact Tabs Requires Restart

Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.

Rated 4 out of 5 stars (54)
14,562 users

ThunderBirthDay Requires Restart

Display birthdays from the Thunderbird addressbooks as events in Lightning.

Rated 4 out of 5 stars (87)
12,561 users

Provider for Exchange ActiveSync

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

Rated 5 out of 5 stars (2)
10,399 users

AddressBook in Tab Requires Restart

Adds a button that can be put in toolbars which opens the addressbook in a new tab like pastismans AddressBookTab

Rated 4 out of 5 stars (11)
10,075 users

Provider for CalDAV & CardDAV

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

Rated 5 out of 5 stars (7)
6,741 users

CategoryManager Requires Restart

Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).

Rated 5 out of 5 stars (9)
4,691 users

Duplicate Contacts Manager Requires Restart

This Thunderbird add-on searches address book(s) for pairs of matching contact entries.
It can automatically delete entries that have equivalent or less information than the other one.
Any remaining matches are presented for manual treatment.

Rated 5 out of 5 stars (8)
4,436 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (16)
3,760 users

Auto Address Cleaner Requires Restart

Removes comment, display name automatically from addresses before sending mail.

Rated 5 out of 5 stars (54)
3,701 users

Address Move Button Requires Restart

Allow you to add a Address Move Button to mail compose window.

Rated 5 out of 5 stars (2)
3,187 users

Contacts Sidebar Requires Restart

Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.

Visit my Contacts Sidebar site for recent versions and news.

Rated 4 out of 5 stars (243)
2,501 users

MRC Compose Requires Restart

Remplace la liste d'adresses par les champs standards (Pour, Copie à, Copie cachée à) avec l'autocomplétion.
Provides standards fields (TO, CC, BCC) with autocomplete to Thunderbird's compose pane.
For bug reports, please use support email.

Rated 4 out of 5 stars (51)
2,039 users

AddressBookTab Requires Restart

It adds a button that can be put in toolbars and that open the addressbook in a new tab

Rated 4 out of 5 stars (63)
1,740 users