Mozilla has released the next update on the Thunderbird 38.x branch with Thunderbird 38.4.0 on November 25th. A cached version of the release notes shows a release date of November 23rd and currently the page is bringing up a Mozilla 404 page. For those user who have Lightning installed, the add-on should auto-update to version 4.0.4 when Thunderbird is updated. Updates in this release include:
- Fixed issue where messages moves of multiple messages from a maildir folder to an mbox folder failed.
- Various security fixes
Depending on their update settings may be prompted to update in the next 24-48 hours or can get the update from within Thunderbird via Help > About Thunderbird and following the prompts. Users can also download and manually install the newest verison of Thunderbird via the getthunderbird.com site. The next planned update for the Thunderbird 38.x branch is Thunderbird 38.5.0 on/around December 15, 2015.