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Thunderbird 140 Released (lwn.net) 13

An anonymous reader shares a blog post: 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.

Thunderbird 140 is an extended-support release (ESR) which will be supported for 12 months. However, the Thunderbird project is trying to encourage users to adopt the Release channel for monthly updates instead. The project is staggering upgrades to 140 for existing Thunderbird users in order to catch any significant bugs before they are widely deployed, but users can upgrade manually via the Help > About menu. See the release notes for a full list of changes.

Thunderbird 140 Released

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  • Thunderbird client, experimental support for Microsoft Exchange

    I'll have to test it out. If it can sync with 365 calendars and contacts as well, I'll happily switch.

    • by GoTeam ( 5042081 )

      I'll have to test it out. If it can sync with 365 calendars and contacts as well, I'll happily switch.

      It offers a 365 connection option, but it then says you need a paid license to use that feature (provided by what looks like a 3rd party provider). Oh well

    • by test321 ( 8891681 ) on Tuesday July 08, 2025 @05:21PM (#65506244)

      I have been using TB with 365 mail, calendars and contacts for a long time. I use DavMail as a connector. DavMail appears as a POP/IMAP/SMTP/LDAP local server to which any UserAgent can connect. It handles the O365 protocol in the backstage (it only needs the TenantID; regular email password is managed by the UA; DavMail displays the MFA window as needed).

      Davmail is FOSS and already packaged in your linux distro https://davmail.sourceforge.ne... [sourceforge.net]

      It allows to use a O365 account homogeneously on a computer even when not all software support the protocol, centralising the session cookie. You could use TB and mutt for example.

      Limitations. I found the Calendar to not be entirely reliable (I have the impression some events don't show up) but I don't use calendars often enough to be sure.

  • by Hydrian ( 183536 ) on Tuesday July 08, 2025 @03:26PM (#65505962) Homepage
    No one wants to have their extensions/plug-ins to have a possibility of breaking every month. Then waiting 3 weeks to have the extension plugin to get fixed, and then breaking it again when TB upgrades again in the next month's release cycle. Having your plugins break once a year is bad enough.
    • You need to upgrade the esr once a month or more anyway just to fix the latest batch of security issues.

    • by Torodung ( 31985 )

      What are you on about? I've used Thunderbird since version 2. There was some update that broke extensions, but they literally haven't broken in years.

    • by Samare ( 2779329 )

      Out of the 7 Thunderbird extensions I use, only SysTray-X used to break on each update, until the developer realised that the max version had to be set to 999 (or * like it's done on addons.mozilla.org). https://github.com/Ximi1970/sy... [github.com]
      Since Firefox and Thunderbird switched to WebExtension APIs, extensions almost never break, as the APIs are stable. That wasn't the case with XUL overlay extensions.

  • I've been using K9 mail on my Android phones for a long time. It was unsupported for a while so I was happy when Mozilla took it over and gave it new life. I was wondering if it would eventually be rebranded as Thunderbird, and it looks like both K9 and T-bird are available for Android now with much of the same features and code base. I guess I will put migrating on my to-do list going forward.
  • Notable features include "dark message mode" to adapt message content to dark mode

    This isn't a feature, it's a bug fix. And, it's long overdue. But, huge thanks to the Thunderbird team for addressing this.

  • Is there anything out there that beats this app. Or am I just too comfortable using it?

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