Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Featured Articles

Move Thunderbird data to a new computer

Move Thunderbird data to a new computer

How to move Thunderbird data (accounts, messages, passwords) to a new computer.

Compacting folders

Compacting folders

This article explains how Thunderbird stores messages on a disk drive and why it is necessary to periodically compact (purge).

Filelink for Large Attachments

Filelink for Large Attachments

Messages with large attachments are often rejected by mail servers. Thunderbird can use web-based storage services to send large file attachments.

Profiles - Where Thunderbird stores your messages and other user data

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".

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