Thunderbird 9 Released

Thunderbird 9 has been released on December 20th, 2011. Current Thunderbird 8.0.0 users can update via Help > About Thunderbird. Lightning users, after you have updated to Thunderbird 9.0, your calendars will be broken. To fix this go Tools > Add-ons and then in your add-ons list, at the top of the list click the gear button and select Check for Updates. Lightning will update to version 1.1 (other add-ons may be updated at this time as well) and once you restart Thunderbird, your calendars will be working again.

What’s new in Thunderbird 9.0:

  • Thunderbird is based on the new Mozilla Gecko 9 engine
  • New opt-in system for users to send performance and usability data back to Mozilla to improve future versions of Thunderbird
  • Additional support for Personas in the compose and address book windows
  • Better keyboard handling for attachments
  • Windows users can hide the menu bar (and show it with the “alt” key)
  • Several user interface fixes and improvements
  • Fixed several security issues

Users can also manually download Thunderbird 9.0 via and then install over your existing Thunderbird 8.0.x install. The next scheduled released is Thunderbird 10.0 on January 31st, 2012.

3 Comments on Thunderbird 9 Released

  1. Thanks for the info Lightning is now showing everything as before

  2. Thank you so much, you have spared my time after the Ubuntu 11.10 upgrade to FF and TB 9… my calendar was missing me much !

  3. Hi,

    When users update, Lightning should also be updated assuming the dialogs are followed though. Saying it will be broken is wrong – this is something I have tested many times and never had an issue with (and hence I would say “may” rather than “will”).

    I do accept the reports I have seen suggest there is a problem with the update mechanism somewhere, which I am very keen to track down.

    If you think you have reproducible (or even semi-reproducible) steps that end up with Lightning being broken after update, please file a bug and cc me (:standard8).


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