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ThunderbirdThunderbird ESR
Release Notes

v.10.0.4, released: April 24, 2012

Check out what’s new and known issues for this version of Thunderbird ESR 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 Thunderbird changes in this release. Firefox/core changes may be found here.

What’s New

    Security fixes can be found here
    Using MAPI send with Thunderbird in offline mode will now work correctly (298126)
    Language packs will now work for all releases of an ESR branch (723138)

Known Issues

  • Unresolved
    If you are unable to view content for your RSS feeds in the Wide View Layout, you may need to disable the Lightning Calendar add-on if you have it installed or switch to Classic View and restart Thunderbird. (see 531397)