Fix slowness, crashing, error messages and other problems

Mozilla Crash Reporter TB

The Mozilla Crash Reporter dialog box appears when Thunderbird crashes and lets you send a crash report. Learn how it works and how to access your crash reports.

Compacting folders - Potential complications

Help the user understand some of the things that may go wrong when compacting.

Troubleshoot Mode Thunderbird

How to use Thunderbird's Troubleshoot Mode to find and fix problems, especially if they are caused by add-ons.

Cannot send messages

If you cannot send messages with Thunderbird, this page provides a series of steps you can follow to check for common problems.

Rebuilding the Global Database

Rebuilding the Global Database will initiate a re-indexing of emails and address book cards (newsgroup messages are not indexed).

FAQ Changing IMAP to POP

If your mail server supports both IMAP and POP, Thunderbird will use IMAP by default. Use these instructions to manually configure a POP account.

Cannot receive messages

If you cannot receive messages, this page provides a series of steps you can use to check for common problems.

Sending and Receiving Messages on Thunderbird

How to send and receive email messages using Thunderbird.

Cannot delete messages

This article explains how to fix issues with message deletion caused by a missing or corrupted trash folder.

Profiles - Where Thunderbird stores your messages and other user data

Thunderbird saves personal information such as messages, passwords and user preferences in a set of files called a "profile".

Hyperlinks in Messages Not Working

When clicking hyperlinks in email, your default web browser should open and display their content. Learn why that may fail and why links may not be clickable.