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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 51.0beta, first offered to channel users on January 18, 2017
Calendar: Event can now be created and edited in a tab. (Preview feature: Set preference calendar.item.editInTab to enable)
Chat: Support Jabber/XMPP Message Carbons (XEP-280)
Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false)
IMAP caching now uses Mozilla's latest caching technology
Message preview pane non-functional after IMAP folder was renamed or moved
Various corrections when composing messages in paragraph format
Text encoding of reply sometimes incorrect (uses encoding of last viewed message)
Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment)
"Move To" button on "Search Messages" panel not working
Message sent to "undisclosed recipients" shows no recipient (non-functional since Thunderbird version 38)
Calendar: Events are not always printed in the correct timezone (in month and week grid)
Due to an Apple touch bar bug, Thunderbird on recent MacBook Pro may crash when open for long periods or crash after resuming from sleep. Apple reports to have a fix for this in the currently unreleased OS X 10.12.3