Skip to content
Email Tools — An Independent Directory —
Betterbird logo

Betterbird

Betterbird is a free, open-source Thunderbird fork for Windows, Mac, and Linux that ships bug fixes and exclusive features ahead of Thunderbird's release cycle, including multi-line message list, improved quick filters, and system tray support.

Our take

Betterbird is the answer to a specific question: what if Thunderbird shipped certain fixes and improvements faster? The fork is maintained by a small team of developers who take Thunderbird’s Extended Support Release as the base, apply their own fixes and exclusive features, and release the result. The multi-line message list and system tray support alone make it worth considering for Thunderbird users who miss those specific behaviors from other clients.

The honest context: Betterbird is a small project. The volunteer team is capable and the releases are regular (the February 2026 build is version 140.8.0esr-bb19), but there is no organizational structure or funding backing it. For personal use, this is entirely fine. For enterprise deployment, the support and governance questions are real.

What stands out

Multi-line message list. Thunderbird’s default message list shows one line per email. Betterbird adds a multi-line view (like Outlook or Postbox) that shows sender, subject, and date in a denser, more informative layout. For users who scan the message list frequently, this improves information density without sacrificing readability.

System tray support. Betterbird can minimize to the system tray on Windows, keeping it running in the background without occupying a taskbar slot. This was present in older Thunderbird versions and Betterbird restores it.

Ships fixes faster. Betterbird incorporates bug fixes — including encrypted message search improvements and filter enhancements — that are on Thunderbird’s roadmap but not yet in a stable release. If you hit a specific Thunderbird bug, there is a reasonable chance Betterbird has already addressed it.

Where it falls short

The project’s sustainability depends on a small volunteer team. If key maintainers move on, the fork slows or stops. For users who rely on their email client for critical communication, this is a real consideration that Thunderbird (backed by MZLA Technologies) does not share.

Who should pick Betterbird

Pick Betterbird if you are a Thunderbird user who wants specific improvements (multi-line list, tray icon, faster bug fixes) and are comfortable with a smaller community project. If Thunderbird itself works for your needs, the delta may not be worth the switch. Betterbird is not for users new to open-source email clients.

References

Pros

  • Ships Thunderbird improvements faster than the main project — bug fixes that Thunderbird will eventually include, available today
  • Multi-line message list is a meaningful layout improvement for users who prefer Outlook-style density
  • Completely free with the same extension ecosystem as Thunderbird
  • System tray support eliminates the taskbar clutter for users who prefer background email clients
  • Stays close to Thunderbird ESR, so it inherits all Thunderbird security fixes promptly

Cons

  • Maintained by a very small volunteer team — no organizational backing beyond community support
  • Not as well known as Thunderbird, which can complicate IT support in enterprise environments
  • No Android or iOS client — desktop only, like Thunderbird
  • The fork model means Betterbird is always reactive to Thunderbird's upstream decisions
  • No Exchange-native integration — same Owl-for-Exchange limitation as Thunderbird

Features

  • Multi-line message list view (similar to Outlook, Lotus Notes, and Postbox)
  • System tray icon with minimize-to-tray support
  • Complex search term support beyond Thunderbird's standard search
  • Quick filter for untagged messages
  • Global search in encrypted messages
  • Configurable display of address columns in the message list
  • Options to prefer sending plain text or HTML per message
  • Re-introduced header button customization menu (removed from upstream Thunderbird)
  • Unix Movemail support
  • Soft fork: stays close to Thunderbird's Extended Support Releases (ESR) base
  • All Thunderbird features: IMAP, POP3, OpenPGP, S/MIME, Lightning calendar, extensions
  • Regular updates aligned with Thunderbird ESR security patches