Thunderbird Beta Notes

Version 51.0beta, first offered to Beta channel users on January 18, 2017

Check out "What’s New" and "Known Issues" for this version of Thunderbird below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

What’s New

  • New

    Calendar: Event can now be created and edited in a tab. (Preview feature: Set preference calendar.item.editInTab to enable)

  • New

    Chat: Support Jabber/XMPP Message Carbons (XEP-280)

  • Changed

    Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false)

  • Changed

    IMAP caching now uses Mozilla's latest caching technology

  • Fixed

    Message preview pane non-functional after IMAP folder was renamed or moved

  • Fixed

    Text encoding of reply sometimes incorrect (uses encoding of last viewed message)

  • Fixed

    Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment)

  • Fixed

    "Move To" button on "Search Messages" panel not working

  • Fixed

    Message sent to "undisclosed recipients" shows no recipient (non-functional since Thunderbird version 31)

  • Fixed

    Various corrections when composing messages in paragraph format

  • Fixed

    Calendar: Events are not always printed in the correct timezone (in month and week grid)

Known Issues

  • unresolved

    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