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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 58.0beta, first offered to channel users on November 27, 2017
When composing a message, attachments can now be reordered
Thunderbird Chat now contains multiple built-in message themes
Thunderbird Chat: Nicknames inside of messages are colored to match the participants list
Better error handling for Yahoo accounts
Outlook import
Performance problem when repairing, rebuilding or compacting folders or accessing large folders
Localised versions of Thunderbird didn't show a localised name for Hotmail's "Deleted" folder