Fix slowness, crashing, error messages and other problems

Procedures to diagnose and fix problems

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).

Cannot delete messages

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

Cannot receive messages

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

Dangerous directories

Some system folders are not allowed when setting Thunderbird storage location as they cause issues.

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