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Welcome to Thunderbird 140 “Eclipse”
Quoting: Welcome to Thunderbird 140 “Eclipse” - The Thunderbird Blog —
The wait is over! Thunderbird 140 “Eclipse” has reached totality. From all of us at the Thunderbird project, from MZLA staff and the Thunderbird Council to our global community of contributors, we’re excited to announce the latest Extended Support Release has arrived.
Eclipse not only builds on Thunderbird 128 “Nebula,” but also the recent features and improvements from the Monthly Release channel. This latest release transforms your email experience with adaptive dark messaging and improved visual controls. Enhanced features keep everyday email tasks light and effortless, while the streamlined new Account Hub ensures adding new accounts is a snap.
Linuxiac:
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Thunderbird 140 “Eclipse” Brings Native Experimental Exchange Support
Mozilla has just unveiled Thunderbird version 140 “Eclipse” of its widely adopted free and open-source desktop email client, now available for download, as the new Extended Support Release (ESR) that replaces last year’s “Nebula” line.
For two decades, Thunderbird users who needed to connect to on-premises Exchange servers or Exchange Online accounts where IMAP had been disabled were directed toward paid add-ons, such as ExQuilla or Owl, or advised to use Microsoft Outlook as an alternative. But no more.
OMG Ubuntu:
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Thunderbird 140 ESR Released with New Features - OMG! Ubuntu
Thunderbird 140 is the latest monthly update, while Thunderbird 140 ESR is the newest ‘extended support maintenance’ release (that businesses, enterprises and home users who set a dependable, stable base and unchanging UI can opt for).
Until recently, most Thunderbird installs would track ESR releases, but at the start of 2025 that changed. New installs (those downloaded from the Thunderbird website) now follow the monthly release cadence, which brings new features to more users, more often.
Which version you can upgrade to will depend on your prior choices or your Linux distribution’s preferred release stream. Existing Thunderbird ESR users won’t be upgraded to 140 for a few months, but can choose to do so sooner – just an FYI.
LWN:
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Thunderbird 140 released
Version 140 of the Thunderbird mail client has been released. Notable features include "dark message mode" to adapt message content to dark mode, the ability to easily transfer desktop settings to the mobile Thunderbird client, experimental support for Microsoft Exchange, as well as global controls for message threading and sort order.