Thunderbird 140 released

Version140 of the Thunderbird mail client has been released. Notablefeatures include "dark message mode" to adapt message contentto dark mode, the ability to easily transfer desktopsettings to the mobile Thunderbird client, experimental support forMicrosoft Exchange, as well as global controls for message threadingand sort order.

Thunderbird140 is an extended-supportrelease (ESR) which will be supported for 12 months. However, theThunderbird project is trying to encourage users to adopt the Releasechannel for monthly updates instead. The project is staggeringupgrades to 140 for existing Thunderbird users in order to catch anysignificant bugs before they are widely deployed, but users canupgrade manually via the Help > Aboutmenu. See the releasenotes for a full list of changes.