IMAP stands for the Internet Message Access Protocol. It enables a mail client (such as Thunderbird) to access messages stored on a mail server. It is more modern and fully featured than POP (Post Office Protocol), which is the other major protocol for accessing mail messages. Most email providers now support IMAP. To see whether your account uses IMAP or POP, check the Server Settings page in the Account Settings.
The menu items File, Edit, View, etc. are located in the menu bar. This article will help you restore a missing menu bar.
This document answers questions for new users of Thunderbird 78, in particular users who have upgraded from a previous version.
This article explains how the "archive" feature of Thunderbird works.
This article explains how Thunderbird's adaptive filter learns to identify junk mail ("spam").
Add-ons add functionality to Thunderbird or change its appearance. Learn how to install add-ons to Thunderbird.
This article explains how to switch from a POP to an IMAP account in Thunderbird.
Threading is a useful way of displaying message list in Thunderbird with your messages grouped in tree structures by conversations. Here's how to enable it.
How to create Tables in emails. Tables use columns and rows to create cells which can contain text or images.
Learn how to add a list of holidays to your calendar in Thunderbird.
Learn how to customize the sound that plays when a new email message is received.
The Ignore Thread (or Subthread) feature is very useful for mailing lists. It lets you skip reading the rest of a conversation you're not really interested in.
A mailing list is used to send one email to a group of contacts. This article explains how to create and use mailing lists in Thunderbird.
This article will explain how to uninstall Thunderbird from your computer
How to update to the latest version of Thunderbird on Windows XP and Vista.
If Thunderbird is specified as your system's default email application, it will integrate with other applications (such as word processors and web browsers).
Messages with large attachments are often rejected by mail servers. Thunderbird can use web-based storage services to send large file attachments.
Instantly take part of a message and search for it in Bing, Yahoo, Twitter or other websites.
Find out about all of the Accessibility features available in Thunderbird.
Open Search enables Thunderbird users to search various websites from within Thunderbird. This article describes how to add additional websites to the Open Search interface.
Thunderbird stores your personal information and settings in a profile folder. Learn to work with different profiles on Thunderbird.
Make Thunderbird require you to enter a master password in order to view or use passwords you've told Thunderbird to remember.
How to create a Thunderbird performance profile to find causes of high CPU load or slowness.
If you cannot send messages with Thunderbird, this page provides a series of steps you can use to check for common problems.