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Add-ons are extensions and other additions that add new functionality to Thunderbird or change its appearance.
How to set up Yahoo! services (including AOL, ATT and other services that use Yahoo servers) in Thunderbird.
Messages with large attachments are often rejected by mail servers. Thunderbird can use web-based storage services to send large file attachments.
Thunderbird saves personal information such as messages, passwords and user preferences in a set of files called a "profile".
