# History of Mozilla Thunderbird

Mozilla Thunderbird was originally launched as Minotaur, shortly after Phoenix (the original name for Mozilla Firefox); the project failed to gain momentum. With the success of the Mozilla Firefox, however, demand increased for a mail client to go with it, and the work on Minotaur was revived under the new name of Thunderbird, and migrated to the new toolkit developed by the Firefox team.

## Early beginnings: A simple email and news client

Significant work on Thunderbird restarted with the announcement that from version 1.5 onwards the main Mozilla suite would be designed around separate applications using this then new toolkit. This contrasted with the previous all-in-one approach, hopefully leading to more efficient and maintainable code, as well as allowing users to mix and match the Mozilla applications with alternatives.
The original Thunderbird logo was just a modified Firebird logo, with a simple shifting of hue value from red to blue. In 2004, together with the change of Firefox's visual identity by Jon Hicks, a more professional logo that is currently in use was introduced.

## Release history

* v
* t
* e
Color chart
| Colour | Meaning |
| Red | Former release; no longer supported |
| Pink | Former test release |
| Yellow | Former release; still supported |
| Green | Current supported release |
| Blue | Future release |
| Gold | Current test release |
| Purple | Future test release |
Current supported release
* Thunderbird 128.3.1esr
* Thunderbird 115.16.1esr
Current test releases
* Thunderbird Beta 132.0b3
* Thunderbird Daily 133.0a1
| Name | Gecko version | Version | Codename | Release date | Significant changes |
| Thunderbird | 1.5 | 0.1 | | 28 July 2003 | First release. |
| Thunderbird | 1.5 | 0.2 | | 3 September 2003 | |
| Thunderbird | 1.5 | 0.3 | | 17 October 2003 | |
| Thunderbird | 1.6 | 0.4 | | 7 December 2003 | |
| Thunderbird | 1.6 | 0.5 | | 9 February 2004 | |
| Thunderbird | 1.7 | 0.6 | | 3 May 2004 | Pinstripe theme for Mac OS X, Windows installer, better junk mail handling, IMAP IDLE and LDAP version 3 support. |
| Thunderbird | 1.7 | 0.7 RC1 | | 14 June 2004 | Polish work. |
| Thunderbird | 1.7 | 0.7 | | 16 June 2004 | Smaller download size, improved IMAP support, updated extension and theme managers. |
| Thunderbird | 1.7 | 0.7.1 | | 28 June 2004 | Bugfix release. |
| Thunderbird | 1.7 | 0.7.2 | | 8 July 2004 | Vulnerability patch (Windows only). |
| Thunderbird | 1.7 | 0.7.3 | | 4 August 2004 | Vulnerability patch. |
| Thunderbird | 1.7 | 0.8 | | 14 September 2004 | Improved Privacy Controls, Global Inbox, RSS/Atom Integration, Improved data migration. Improved spell checker support. |
| Thunderbird | 1.7 | 0.9 | | 3 November 2004 | More RSS integration. Favorite folders. Menu and dialog polish. Message list groups. Virtual folders. |
| Thunderbird 1 | 1.7 | 1.0 RC1 | Thunderbird 1.0 Release Candidate 1 | 1 December 2004 | First Thunderbird release candidate. Bug fixing. Improved theme. Polish work. |
| Thunderbird 1 | 1.7 | 1.0 | Thunderbird 1.0 | 7 December 2004 | Official version 1.0 release. |
| Thunderbird 1 | 1.7 | 1.0.2 | | 21 March 2005 | Security and stability update. |
| Thunderbird 1 | 1.7 | 1.0.5 | | 13 July 2005 | Security and stability update. |
| Thunderbird 1 | 1.7 | 1.0.6 | | 19 July 2005 | Stability update. |
| Thunderbird 1 | 1.7 | 1.0.7 | | 29 September 2005 | Security and stability update. |
| Thunderbird 1 | 1.7 | 1.0.8 | | 21 April 2006 | Security and stability update. End-of-life 1.0.x product line |
| Thunderbird 1.5 | 1.8 | 1.1a1 | Thunderbird 1.1 Alpha 1 | 2 June 2005 | First Thunderbird 1.1 alpha release. Stability improvement and security fixes. |
| Thunderbird 1.5 | 1.8 | 1.1a2 | Thunderbird 1.1 Alpha 2 | 15 July 2005 | Second Thunderbird 1.1 alpha release. |
| Thunderbird 1.5 | 1.8 | 1.5b1 | Thunderbird 1.5 Beta 1 | 9 September 2005 | First Thunderbird 1.5 beta release. New update system (binary patch). |
| Thunderbird 1.5 | 1.8 | 1.5b2 | Thunderbird 1.5 Beta 2 | 7 October 2005 | Second Thunderbird 1.5 beta release. Improvements to automated update system, website rendering and performance. Several security fixes. |
| Thunderbird 1.5 | 1.8 | 1.5 RC1 | Thunderbird 1.5 Release Candidate 1 | 5 November 2005 | First Thunderbird 1.5 release candidate. |
| Thunderbird 1.5 | 1.8 | 1.5 RC2 | Thunderbird 1.5 Release Candidate 2 | 21 December 2005 | Second Thunderbird 1.5 release candidate. |
| Thunderbird 1.5 | 1.8 | 1.5 | Thunderbird 1.5 | 11 January 2006 | Official version 1.5 release. Identical to 1.5 RC2. |
| Thunderbird 1.5 | 1.8 | 1.5.0.2 | | 21 April 2006 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.4 | | 1 June 2006 | Security and stability update. Native support for Intel-based Macintosh computers by shipping universal binary. |
| Thunderbird 1.5 | 1.8 | 1.5.0.5 | | 27 July 2006 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.7 | | 14 September 2006 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.8 | | 8 November 2006 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.9 | | 19 December 2006 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.10 | | 1 March 2007 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.12 | | 30 May 2007 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.13 | | 23 August 2007 | Security and stability update. |
| Thunderbird 1.5 | 1.8 | 1.5.0.14 | | 19 December 2007 | Security and stability update. End-of-life 1.5.0.x product line |
| Thunderbird 2 | 1.8.1 | 2.0a1 | Thunderbird 2.0 Alpha 1 | 28 July 2006 | First Thunderbird 2 alpha release. Message Tags. Folder Views including favorite folders. Improved new mail notification alerts. New Windows installer based on Nullsoft Scriptable Install System. Find As You Type in the message pane. New combined and improved Add-ons manager for extensions and themes. Updates to the extension system to provide enhanced security and to allow for easier localization of extensions. |
| Thunderbird 2 | 1.8.1 | 2.0b1 | Thunderbird 2.0 Beta 1 | 12 December 2006 | First Thunderbird 2 beta release. Improved theme. Session history navigation. Improved offline management. Folder summary popups. Improved performance in saved search folders. Improved filing tools. |
| Thunderbird 2 | 1.8.1 | 2.0b2 | Thunderbird 2.0 Beta 2 | 23 January 2007 | Second Thunderbird 2 beta release. |
| Thunderbird 2 | 1.8.1 | 2.0 RC1 | Thunderbird 2.0 Release Candidate 1 | 6 April 2007 | First Thunderbird 2 release candidate. |
| Thunderbird 2 | 1.8.1 | 2.0 | Thunderbird 2.0 | 18 April 2007 | Official version 2.0 release. Identical to 2.0 RC1. Windows Vista support, message tags, new visual theme, improved extension support, improved new email notifications, folder summary pop-ups, find text in messages search tool, new Windows installer, easy access to popular email services, advanced folder views, session history navigation, and saved search folder performance. |
| Thunderbird 2 | 1.8.1 | 2.0.0.4 | | 14 June 2007 | Security and stability update. Korean locale was added. |
| Thunderbird 2 | 1.8.1 | 2.0.0.5 | | 19 July 2007 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.6 | | 1 August 2007 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.9 | | 14 November 2007 | Security and stability update. Hebrew locale was added. |
| Thunderbird 2 | 1.8.1 | 2.0.0.12 | | 26 February 2008 | Security and stability update. Afrikaans and Ukrainian locales were added. |
| Thunderbird 2 | 1.8.1 | 2.0.0.14 | | 1 May 2008 | Security and stability update. Includes fixes that would have been part of Thunderbird 2.0.0.13 which was officially abandoned on 14 April 2008. |
| Thunderbird 2 | 1.8.1 | 2.0.0.16 | | 23 July 2008 | Security and stability update. Replacement for Thunderbird 2.0.0.15 which was officially abandoned on 27 June 2008. |
| Thunderbird 2 | 1.8.1 | 2.0.0.17 | | 25 September 2008 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.18 | | 19 November 2008 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.19 | | 30 December 2008 | Security and stability update. Shipped with equivalent fixes to Firefox 2.0.0.20. |
| Thunderbird 2 | 1.8.1 | 2.0.0.21 | | 18 March 2009 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.22 | | 22 June 2009 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.23 | | 20 August 2009 | Security and stability update. |
| Thunderbird 2 | 1.8.1 | 2.0.0.24 | | 15 March 2010 | Security and stability update. End-of-life 2.0.0.x product line |
| Thunderbird 3 | 1.9 | 3.0a1 | Shredder Alpha 1 | 13 May 2008 | First Thunderbird 3 alpha release. |
| Thunderbird 3 | 1.9 | 3.0a2 | Shredder Alpha 2 | 12 August 2008 | Second Thunderbird 3 alpha release. |
| Thunderbird 3 | 1.9.1 | 3.0a3 | Shredder Alpha 3 | 14 October 2008 | Third Thunderbird 3 alpha release. |
| Thunderbird 3 | 1.9.1 | 3.0b1 | Thunderbird 3.0 Beta 1 | 9 December 2008 | First Thunderbird 3 beta release. |
| Thunderbird 3 | 1.9.1 | 3.0b2 | Thunderbird 3.0 Beta 2 | 26 February 2009 | Second Thunderbird 3 beta release. |
| Thunderbird 3 | 1.9.1 | 3.0b3 | Thunderbird 3.0 Beta 3 | 21 July 2009 | Third Thunderbird 3 beta release. Major features added, theme redesigns. |
| Thunderbird 3 | 1.9.1 | 3.0b4 | Thunderbird 3.0 Beta 4 | 22 September 2009 | Fourth Thunderbird 3 beta release. New Gloda search functionality enabled. |
| Thunderbird 3 | 1.9.1 | 3.0 RC1 | Thunderbird 3.0 Release Candidate 1 | 24 November 2009 | First Thunderbird 3 release candidate. |
| Thunderbird 3 | 1.9.1 | 3.0 RC2 | Thunderbird 3.0 Release Candidate 2 | 1 December 2009 | Second Thunderbird 3 release candidate. |
| Thunderbird 3 | 1.9.1 | 3.0 | Thunderbird 3.0 | 8 December 2009 | Official version 3.0 release. |
| Thunderbird 3 | 1.9.1 | 3.0.1 | | 20 January 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.2 | | 25 February 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.3 | | 1 March 2010 | Off-cycle stability update. Fix for missing folders or empty folder panel after updating to Thunderbird 3.0.2. |
| Thunderbird 3 | 1.9.1 | 3.0.4 | | 30 March 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.5 | | 17 June 2010 | Off-cycle stability update. Improves the performance of indexing messages and accessing profiles stored on a network as well as the unread email notification on Mac OS X. Several fixes to the user interface. |
| Thunderbird 3 | 1.9.1 | 3.0.6 | | 20 July 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.7 | | 7 September 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.8 | | 16 September 2010 | Off-cycle stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.9 | | 19 October 2010 | Regular security and stability update. |
| Thunderbird 3 | 1.9.1 | 3.0.10 | | 27 October 2010 | Off-cycle security update. |
| Thunderbird 3 | 1.9.1 | 3.0.11 | | 9 December 2010 | Regular security and stability update. End-of-life 3.0.x product line |
| Thunderbird 3.1 | 1.9.2 | 3.1a1 | Lanikai Alpha 1 | 3 February 2010 | First Thunderbird 3.1 alpha release. |
| Thunderbird 3.1 | 1.9.2 | 3.1b1 | Thunderbird 3.1 Beta 1 | 10 March 2010 | First Thunderbird 3.1 beta release. |
| Thunderbird 3.1 | 1.9.2 | 3.1b2 | Thunderbird 3.1 Beta 2 | 5 May 2010 | Second Thunderbird 3.1 beta release. |
| Thunderbird 3.1 | 1.9.2 | 3.1 RC1 | Thunderbird 3.1 Release Candidate 1 | 27 May 2010 | First Thunderbird 3.1 release candidate. |
| Thunderbird 3.1 | 1.9.2 | 3.1 RC2 | Thunderbird 3.1 Release Candidate 2 | 9 June 2010 | Second Thunderbird 3.1 release candidate. |
| Thunderbird 3.1 | 1.9.2 | 3.1 | Thunderbird 3.1 | 24 June 2010 | Official version 3.1 release. |
| Thunderbird 3.1 | 1.9.2 | 3.1.1 | | 20 July 2010 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.2 | | 5 August 2010 | Off-cycle stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.3 | | 7 September 2010 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.4 | | 16 September 2010 | Off-cycle stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.5 | | 19 October 2010 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.6 | | 27 October 2010 | Off-cycle security update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.7 | | 9 December 2010 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.8 | | 1 March 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.9 | | 4 March 2011 | Off-cycle stability update. Fixed post-update crash affecting some users. |
| Thunderbird 3.1 | 1.9.2 | 3.1.10 | | 28 April 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.11 | | 21 June 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.12 | | 16 August 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.13 | | 31 August 2011 | Off-cycle security update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.14 | | 6 September 2011 | Off-cycle security update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.15 | | 27 September 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.16 | | 8 November 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.17 | | 20 December 2011 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.18 | | 31 January 2012 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.19 | | 16 February 2012 | Regular security and stability update. |
| Thunderbird 3.1 | 1.9.2 | 3.1.20 | | 12 March 2012 | Regular security and stability update. End-of-life 3.1.x product line on 24 April 2012. |
| Thunderbird 5 | 2.0 | 3.3a1 | Miramar Alpha 1 | 23 November 2010 | First Thunderbird 3.3 alpha release. |
| Thunderbird 5 | 2.0 | 3.3a2 | Miramar Alpha 2 | 20 January 2011 | Second Thunderbird 3.3 alpha release. |
| Thunderbird 5 | 2.0 | 3.3a3 | Miramar Alpha 3 | 15 March 2011 | Third Thunderbird 3.3 alpha release. |
| Thunderbird 5 | 2.0 | 3.4a1 | Thunderbird Nightly 3.4 | 10 May 2011 | First Thunderbird 3.4 alpha release. |
| Thunderbird 5 | 5.0 | 5.0b1 | Thunderbird 5.0 Beta 1 | 2 June 2011 | First Thunderbird 5.0 beta release. |
| Thunderbird 5 | 5.0 | 5.0b2 | Thunderbird 5.0 Beta 2 | 22 June 2011 | Second Thunderbird 5.0 beta release. |
| Thunderbird 5 | 5.0 | 5.0 | Thunderbird 5.0 | 28 June 2011 | New features including Add-ons Manager, New Troubleshooting Information page; Revised account creation wizard, Tabs can now be reordered and dragged to different windows, Attachment sizes now displayed along with attachments, Plugins can now be loaded in RSS feeds by default; Over 390 platform fixes that improve speed, performance, stability and security, including improved responsiveness and faster start-up, theme fixes for Windows Vista and Windows 7, and support for Mac 32/64 bit Universal builds; End of Support for PowerPC-based Apple Computers. End-of-life 5.0.x product line on 16 August 2011. |
| Thunderbird 6 | 6.0 | 6.0a2 | Thunderbird 6.0 Earlybird | 16 June 2011 | First Thunderbird 6.0 Earlybird build. |
| Thunderbird 6 | 6.0 | 6.0b1 | Thunderbird 6.0 Beta 1 | 20 July 2011 | First Thunderbird 6.0 beta release. |
| Thunderbird 6 | 6.0 | 6.0b2 | Thunderbird 6.0 Beta 2 | 2 August 2011 | Second Thunderbird 6.0 beta release. |
| Thunderbird 6 | 6.0 | 6.0b3 | Thunderbird 6.0 Beta 3 | 10 August 2011 | Third Thunderbird 6.0 beta release. |
| Thunderbird 6 | 6.0 | 6.0 | Thunderbird 6.0 | 16 August 2011 | Based on Gecko 6 engine as well as fixes to user interview and security; platform fixes that improve speed, performance and stability; Windows 7 support adds jump lists and includes several theme improvements; fixes to improve importing email from Microsoft Outlook; for Linux, default mail client check works with newer distributions |
| Thunderbird 6 | 6.0 | 6.0.1 | Thunderbird 6.0.1 | 31 August 2011 | Off-cycle security update. |
| Thunderbird 6 | 6.0 | 6.0.2 | Thunderbird 6.0.2 | 6 September 2011 | Off-cycle security update. End-of-life 6.0.x product line on 27 September 2011. |
| Thunderbird 7 | 7.0 | 7.0a1 | Thunderbird 7.0 Nightly | 27 May 2011 | First Thunderbird 7.0 Nightly build. |
| Thunderbird 7 | 7.0 | 7.0a2 | Thunderbird 7.0 Earlybird | 6 July 2011 | First Thunderbird 7.0 Earlybird build. |
| Thunderbird 7 | 7.0 | 7.0b1 | Thunderbird 7.0 Beta 1 | 26 August 2011 | First Thunderbird 7.0 beta release. |
| Thunderbird 7 | 7.0 | 7.0b2 | Thunderbird 7.0 Beta 2 | 6 September 2011 | Second Thunderbird 7.0 beta release. |
| Thunderbird 7 | 7.0 | 7.0b3 | Thunderbird 7.0 Beta 3 | 20 September 2011 | Third Thunderbird 7.0 beta release. |
| Thunderbird 7 | 7.0 | 7.0 | Thunderbird 7.0 | 27 September 2011 | Based on Gecko 7 engine as well as fixes to user interview and security; support for printing summary of selected email messages; fixes to attachment handling; platform-specific improvements to Address Book |
| Thunderbird 7 | 7.0 | 7.0.1 | Thunderbird 7.0.1 | 30 September 2011 | Off-cycle stability update. Fixed a rare issue where some users could find one or more of their add-ons hidden after a Thunderbird update. End-of-life 7.0.x product line on 8 November 2011. |
| Thunderbird 8 | 8.0 | 8.0a1 | Thunderbird 8.0 Nightly | 6 July 2011 | First Thunderbird 8.0 Nightly build. |
| Thunderbird 8 | 8.0 | 8.0a2 | Thunderbird 8.0 Earlybird | 17 August 2011 | First Thunderbird 8.0 Earlybird build. |
| Thunderbird 8 | 8.0 | 8.0b1 | Thunderbird 8.0 Beta 1 | 4 October 2011 | First Thunderbird 8.0 beta release. |
| Thunderbird 8 | 8.0 | 8.0b2 | Thunderbird 8.0 Beta 2 | 12 October 2011 | Second Thunderbird 8.0 beta release. |
| Thunderbird 8 | 8.0 | 8.0b3 | Thunderbird 8.0 Beta 3 | 19 October 2011 | Third Thunderbird 8.0 beta release. |
| Thunderbird 8 | 8.0 | 8.0b4 | Thunderbird 8.0 Beta 4 | 1 November 2011 | Fourth Thunderbird 8.0 beta release. |
| Thunderbird 8 | 8.0 | 8.0b5 | Thunderbird 8.0 Beta 5 | 3 November 2011 | Fifth Thunderbird 8.0 beta release. |
| Thunderbird 8 | 8.0 | 8.0 | Thunderbird 8.0 | 8 November 2011 | Based on Gecko 8 engine, with security and stability fixes; Add-ons installed by third parties now disabled by default; New Search and Find Shortcuts; Improved accessibility of the attachment list; Folder switching pane widget removed and repackaged as an add-on End-of-life 8.0.x product line on 20 December 2011. |
| Thunderbird 9 | 9.0 | 9.0a1 | Thunderbird 9.0 Nightly | 17 August 2011 | First Thunderbird 9.0 Nightly build. |
| Thunderbird 9 | 9.0 | 9.0a2 | Thunderbird 9.0 Earlybird | 28 September 2011 | First Thunderbird 9.0 Earlybird build. |
| Thunderbird 9 | 9.0 | 9.0b1 | Thunderbird 9.0 Beta 1 | 16 November 2011 | First Thunderbird 9.0 beta release. |
| Thunderbird 9 | 9.0 | 9.0b2 | Thunderbird 9.0 Beta 2 | 24 November 2011 | Second Thunderbird 9.0 beta release. |
| Thunderbird 9 | 9.0 | 9.0b3 | Thunderbird 9.0 Beta 3 | 1 December 2011 | Third Thunderbird 9.0 beta release. |
| Thunderbird 9 | 9.0 | 9.0b4 | Thunderbird 9.0 Beta 4 | 8 December 2011 | Fourth Thunderbird 9.0 beta release. |
| Thunderbird 9 | 9.0 | 9.0b5 | Thunderbird 9.0 Beta 5 | 14 December 2011 | Fifth Thunderbird 9.0 beta release. |
| Thunderbird 9 | 9.0 | 9.0 | Thunderbird 9.0 | 20 December 2011 | Based on Gecko 9 engine, with security and user interface improvements; New opt-in system for sharing performance and usability data with Mozilla; Additional support for Personas in the compose and address book windows; Better keyboard handling for attachments; Windows users can hide the menu bar. |
| Thunderbird 9 | 9.0 | 9.0.1 | Thunderbird 9.0.1 | 23 December 2011 | Off-cycle security and stability update. End-of-life 9.0.x product line on 31 January 2012. |
| Thunderbird 10 | 10.0 | 10.0a1 | Thunderbird 10.0 Nightly | 28 September 2011 | First Thunderbird 10.0 Nightly build. |
| Thunderbird 10 | 10.0 | 10.0a2 | Thunderbird 10.0 Earlybird | 9 November 2011 | First Thunderbird 10.0 Earlybird build. |
| Thunderbird 10 | 10.0 | 10.0b1 | Thunderbird 10.0 Beta 1 | 23 December 2011 | First Thunderbird 10.0 beta release. |
| Thunderbird 10 | 10.0 | 10.0b2 | Thunderbird 10.0 Beta 2 | 9 January 2012 | Second Thunderbird 10.0 beta release. |
| Thunderbird 10 | 10.0 | 10.0b3 | Thunderbird 10.0 Beta 3 | 11 January 2012 | Third Thunderbird 10.0 beta release. |
| Thunderbird 10 | 10.0 | 10.0b4 | Thunderbird 10.0 Beta 4 | 18 January 2012 | Fourth Thunderbird 10.0 beta release. |
| Thunderbird 10 | 10.0 | 10.0b5 | Thunderbird 10.0 Beta 5 | 24 January 2012 | Fifth Thunderbird 10.0 beta release. |
| Thunderbird 10 | 10.0 | 10.0 | Thunderbird 10.0 | 31 January 2012 | Official version 10.0 release. First Extended Support Release (ESR). |
| Thunderbird 10 | 10.0 | 10.0.1 | Thunderbird 10.0.1 | 12 February 2012 | Off-cycle security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.2 | Thunderbird 10.0.2 | 16 February 2012 | Off-cycle security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.3esr | Thunderbird 10.0.3esr | 13 March 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.4esr | Thunderbird 10.0.4esr | 24 April 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.5esr | Thunderbird 10.0.5esr | 6 June 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.6esr | Thunderbird 10.0.6esr | 17 July 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.7esr | Thunderbird 10.0.7esr | 28 August 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.8esr | Thunderbird 10.0.8esr | 9 October 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.9esr | Thunderbird 10.0.9esr | 12 October 2012 | Off-cycle security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.10esr | Thunderbird 10.0.10esr | 29 October 2012 | Off-cycle security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.11esr | Thunderbird 10.0.11esr | 20 November 2012 | Regular security and stability update. |
| Thunderbird 10 | 10.0 | 10.0.12esr | Thunderbird 10.0.12esr | 8 January 2013 | Regular security and stability update. End-of-life 10.0.x product line on 19 February 2013. |
| Thunderbird 11 | 11.0 | 11.0 | Thunderbird 11.0 | 13 March 2012 | Official version 11.0 release. |
| Thunderbird 11 | 11.0 | 11.0.1 | Thunderbird 11.0.1 | 28 March 2012 | Off-cycle security and stability update. End-of-life 11.0.x product line on 24 April 2012. |
| Thunderbird 12 | 12.0 | 12.0 | Thunderbird 12.0 | 24 April 2012 | Official version 12.0 release. |
| Thunderbird 12 | 12.0 | 12.0.1 | Thunderbird 12.0.1 | 30 April 2012 | Off-cycle security and stability update. End-of-life 12.0.x product line on 5 June 2012. |
| Thunderbird 13 | 13.0 | 13.0 | Thunderbird 13.0 | 5 June 2012 | Official version 13.0 release. |
| Thunderbird 13 | 13.0 | 13.0.1 | Thunderbird 13.0.1 | 15 June 2012 | Off-cycle security and stability update. End-of-life 13.0.x product line on 17 July 2012. |
| Thunderbird 14 | 14.0 | 14.0 | Thunderbird 14.0 | 17 July 2012 | Official version 14.0 release. End-of-life 14.0.x product line on 28 August 2012. |
| Thunderbird 15 | 15.0 | 15.0 | Thunderbird 15.0 | 28 August 2012 | Official version 15.0 release. |
| Thunderbird 15 | 15.0 | 15.0.1 | Thunderbird 15.0.1 | 10 September 2012 | Off-cycle security and stability update. End-of-life 15.0.x product line on 9 October 2012. |
| Thunderbird 16 | 16.0 | 16.0 | Thunderbird 16.0 | 9 October 2012 | Official version 16.0 release. |
| Thunderbird 16 | 16.0 | 16.0.1 | Thunderbird 16.0.1 | 11 October 2012 | Off-cycle security and stability update. |
| Thunderbird 16 | 16.0 | 16.0.2 | Thunderbird 16.0.2 | 29 October 2012 | Off-cycle security and stability update. End-of-life 16.0.x product line on 20 November 2012. |
| Thunderbird 17 | 17.0 | 17.0esr | Thunderbird 17.0esr | 20 November 2012 | Official version 17.0esr release. Second Extended Support Release (ESR). |
| Thunderbird 17 | 17.0 | 17.0.2esr | Thunderbird 17.0.2esr | 8 January 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.3esr | Thunderbird 17.0.3esr | 19 February 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.4esr | Thunderbird 17.0.4esr | 11 March 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.5esr | Thunderbird 17.0.5esr | 2 April 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.6esr | Thunderbird 17.0.6esr | 14 May 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.7esr | Thunderbird 17.0.7esr | 25 June 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.8esr | Thunderbird 17.0.8esr | 6 August 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.9esr | Thunderbird 17.0.9esr | 17 September 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.10esr | Thunderbird 17.0.10esr | 29 October 2013 | Regular security and stability update. |
| Thunderbird 17 | 17.0 | 17.0.11esr | Thunderbird 17.0.11esr | 19 November 2013 | Off-cycle security and stability update. End-of-life 17.0.x product line on 3 December 2013. |
| Thunderbird 24 | 18.0 | 18.0b1 | Thunderbird 18.0 Beta 1 | 29 November 2012 | First Thunderbird 18.0 beta release. |
| Thunderbird 24 | 19.0 | 19.0b1 | Thunderbird 19.0 Beta 1 | 18 January 2013 | First Thunderbird 19.0 beta release. |
| Thunderbird 24 | 20.0 | 20.0b1 | Thunderbird 20.0 Beta 1 | 8 March 2013 | First Thunderbird 20.0 beta release. |
| Thunderbird 24 | 21.0 | 21.0b1 | Thunderbird 21.0 Beta 1 | 10 April 2013 | First Thunderbird 21.0 beta release. |
| Thunderbird 24 | 22.0 | 22.0b1 | Thunderbird 22.0 Beta 1 | 23 May 2013 | First Thunderbird 22.0 beta release. |
| Thunderbird 24 | 23.0 | 23.0b1 | Thunderbird 23.0 Beta 1 | 3 July 2013 | First Thunderbird 23.0 beta release. |
| Thunderbird 24 | 24.0 | 24.0b1 | Thunderbird 24.0 Beta 1 | 15 August 2013 | First Thunderbird 24.0 beta release (only US English). |
| Thunderbird 24 | 24.0 | 24.0b2 | Thunderbird 24.0 Beta 2 | 29 August 2013 | Second Thunderbird 24.0 beta release. |
| Thunderbird 24 | 24.0 | 24.0b3 | Thunderbird 24.0 Beta 3 | 11 September 2013 | Third Thunderbird 24.0 beta release. |
| Thunderbird 24 | 24.0 | 24.0 | Thunderbird 24.0 | 17 September 2013 | Official version 24.0 release. |
| Thunderbird 24 | 24.0 | 24.0.1 | Thunderbird 24.0.1 | 11 October 2013 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.1.0 | Thunderbird 24.1.0 | 29 October 2013 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.1.1 | Thunderbird 24.1.1 | 19 November 2013 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.2.0 | Thunderbird 24.2.0 | 10 December 2013 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.3.0 | Thunderbird 24.3.0 | 4 February 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.4.0 | Thunderbird 24.4.0 | 18 March 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.5.0 | Thunderbird 24.5.0 | 29 April 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.6.0 | Thunderbird 24.6.0 | 10 June 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.7.0 | Thunderbird 24.7.0 | 22 July 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.8.0 | Thunderbird 24.8.0 | 2 September 2014 | Security and stability update. |
| Thunderbird 24 | 24.0 | 24.8.1 | Thunderbird 24.8.1 | 24 September 2014 | Security update. |
| Thunderbird 31 | 25.0 | 25.0b1 | Thunderbird 25.0 Beta 1 | 17 October 2013 | First Thunderbird 25.0 beta release. |
| Thunderbird 31 | 26.0 | 26.0b1 | Thunderbird 26.0 Beta 1 | 18 November 2013 | First Thunderbird 26.0 beta release. |
| Thunderbird 31 | 27.0 | 27.0b1 | Thunderbird 27.0 Beta 1 | 19 December 2013 | First Thunderbird 27.0 beta release. |
| Thunderbird 31 | 28.0 | 28.0b1 | Thunderbird 28.0 Beta 1 | 7 March 2014 | First Thunderbird 28.0 beta release. |
| Thunderbird 31 | 29.0 | 29.0b1 | Thunderbird 29.0 Beta 1 | 25 April 2014 | First Thunderbird 29.0 beta release. |
| Thunderbird 31 | 30.0 | 30.0b1 | Thunderbird 30.0 Beta 1 | 9 May 2014 | First Thunderbird 30.0 beta release. |
| Thunderbird 31 | 31.0 | 31.0b1 | Thunderbird 31.0 Beta 1 | 13 June 2014 | First Thunderbird 31.0 beta release. |
| Thunderbird 31 | 31.0 | 31.0b2 | Thunderbird 31.0 Beta 2 | 5 July 2014 | Second Thunderbird 31.0 beta release. |
| Thunderbird 31 | 31.0 | 31.0b3 | Thunderbird 31.0 Beta 3 | 16 July 2014 | Third Thunderbird 31.0 beta release. |
| Thunderbird 31 | 31.0 | 31.0 | Thunderbird 31.0 | 22 July 2014 | Official version 31.0 release. |
| Thunderbird 31 | 31.0 | 31.1.0 | Thunderbird 31.1.0 | 2 September 2014 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.1.1 | Thunderbird 31.1.1 | 9 September 2014 | Stability update. |
| Thunderbird 31 | 31.0 | 31.1.2 | Thunderbird 31.1.2 | 24 September 2014 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.2.0 | Thunderbird 31.2.0 | 14 October 2014 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.3.0 | Thunderbird 31.3.0 | 1 December 2014 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.4.0 | Thunderbird 31.4.0 | 13 January 2015 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.5.0 | Thunderbird 31.5.0 | 24 February 2015 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.6.0 | Thunderbird 31.6.0 | 31 March 2015 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.7.0 | Thunderbird 31.7.0 | 12 May 2015 | Security and stability update. |
| Thunderbird 31 | 31.0 | 31.8.0 | Thunderbird 31.8.0 | 17 July 2015 | Security and stability update. |
| Thunderbird 38 | 32.0 | 32.0b1 | Thunderbird 32.0 Beta 1 | 14 August 2014 | |
| Thunderbird 38 | 33.0 | 33.0b1 | Thunderbird 33.0 Beta 1 | 24 September 2014 | |
| Thunderbird 38 | 34.0 | 34.0b1 | Thunderbird 34.0 Beta 1 | 15 November 2014 | |
| Thunderbird 38 | 36.0 | 36.0b1 | Thunderbird 36.0 Beta 1 | 16 February 2015 | |
| Thunderbird 38 | 37.0 | 37.0b1 | Thunderbird 37.0 Beta 1 | 13 March 2015 | |
| Thunderbird 38 | 38.0 | 38.0b1 | Thunderbird 38.0 Beta 1 | 2 April 2015 | |
| Thunderbird 38 | 38.0 | 38.0b2 | Thunderbird 38.0 Beta 2 | 19 April 2015 | |
| Thunderbird 38 | 38.0 | 38.0b3 | Thunderbird 38.0 Beta 3 | 27 April 2015 | |
| Thunderbird 38 | 38.0 | 38.0b4 | Thunderbird 38.0 Beta 4 | 4 May 2015 | |
| Thunderbird 38 | 38.0 | 38.0b5 | Thunderbird 38.0 Beta 5 | 12 May 2015 | |
| Thunderbird 38 | 38.0 | 38.0b6 | Thunderbird 38.0 Beta 6 | 23 May 2015 | |
| Thunderbird 38 | 38.0 | 38.0.1 | Thunderbird 38.0.1 | 11 June 2015 | |
| Thunderbird 38 | 38.0 | 38.1.0 | Thunderbird 38.1.0 | 9 July 2015 | |
| Thunderbird 38 | 38.0 | 38.2.0 | Thunderbird 38.2.0 | 14 August 2015 | |
| Thunderbird 38 | 38.0 | 38.3.0 | Thunderbird 38.3.0 | 29 September 2015 | |
| Thunderbird 38 | 38.0 | 38.4.0 | Thunderbird 38.4.0 | 23 November 2015 | |
| Thunderbird 38 | 38.0 | 38.5.0 | Thunderbird 38.5.0 | 23 December 2015 | |
| Thunderbird 38 | 38.0 | 38.5.1 | Thunderbird 38.5.1 | 7 January 2016 | |
| Thunderbird 38 | 38.0 | 38.6.0 | Thunderbird 38.6.0 | 16 February 2016 | |
| Thunderbird 38 | 38.0 | 38.7.0 | Thunderbird 38.7.0 | 14 March 2016 | |
| Thunderbird 38 | 38.0 | 38.7.1 | Thunderbird 38.7.1 | 25 March 2016 | |
| Thunderbird 38 | 38.0 | 38.7.2 | Thunderbird 38.7.2 | 4 April 2016 | |
| Thunderbird 38 | 38.0 | 38.8.0 | Thunderbird 38.8.0 | 4 May 2016 | |
| Thunderbird 45 | 40.0 | 40.0b1 | Thunderbird 40.0 Beta 1 | 27 July 2015 | |
| Thunderbird 45 | 41.0 | 41.0b1 | Thunderbird 41.0 Beta 1 | 10 September 2015 | |
| Thunderbird 45 | 41.0 | 41.0b2 | Thunderbird 41.0 Beta 2 | 17 September 2015 | |
| Thunderbird 45 | 42.0 | 42.0b1 | Thunderbird 42.0 Beta 1 | 5 October 2015 | |
| Thunderbird 45 | 42.0 | 42.0b2 | Thunderbird 42.0 Beta 2 | 13 October 2015 | |
| Thunderbird 45 | 43.0 | 43.0b1 | Thunderbird 43.0 Beta 1 | 31 December 2015 | |
| Thunderbird 45 | 44.0 | 44.0b1 | Thunderbird 44.0 Beta 1 | 14 January 2016 | |
| Thunderbird 45 | 45.0 | 45.0b1 | Thunderbird 45.0 Beta 1 | 3 February 2016 | |
| Thunderbird 45 | 45.0 | 45.0b2 | Thunderbird 45.0 Beta 2 | 20 February 2016 | |
| Thunderbird 45 | 45.0 | 45.0b3 | Thunderbird 45.0 Beta 3 | 29 March 2016 | |
| Thunderbird 45 | 45.0 | 45.0b4 | Thunderbird 45.0 Beta 4 | 5 April 2016 | |
| Thunderbird 45 | 45.0 | 45.0 | Thunderbird 45.0 | 12 April 2016 | |
| Thunderbird 45 | 45.0 | 45.1b1 | Thunderbird 45.1 Beta 1 | 29 April 2016 | |
| Thunderbird 45 | 45.0 | 45.1.0 | Thunderbird 45.1.0 | 10 May 2016 | |
| Thunderbird 45 | 45.0 | 45.1.1 | Thunderbird 45.1.1 | 31 May 2016 | |
| Thunderbird 45 | 45.0 | 45.2b1 | Thunderbird 45.2 Beta 1 | 20 May 2016 | |
| Thunderbird 45 | 45.0 | 45.2.0 | Thunderbird 45.2.0 | 30 June 2016 | |
| Thunderbird 45 | 45.0 | 45.3.0 | Thunderbird 45.3.0 | 30 August 2016 | |
| Thunderbird 45 | 45.0 | 45.4.0 | Thunderbird 45.4.0 | 4 October 2016 | |
| Thunderbird 45 | 45.0 | 45.5.0 | Thunderbird 45.5.0 | 21 November 2016 | |
| Thunderbird 45 | 45.0 | 45.5.1 | Thunderbird 45.5.1 | 30 November 2016 | |
| Thunderbird 45 | 45.0 | 45.6.0 | Thunderbird 45.6.0 | 28 December 2016 | |
| Thunderbird 45 | 45.0 | 45.7.0 | Thunderbird 45.7.0 | 25 January 2017 | |
| Thunderbird 45 | 45.0 | 45.7.1 | Thunderbird 45.7.1 | 7 February 2017 | |
| Thunderbird 45 | 45.0 | 45.8.0 | Thunderbird 45.8.0 | 7 March 2017 | Last release to support Mac OS X 10.6-10.8. |
| Thunderbird 52 | 47.0 | 47.0b1 | Thunderbird 47.0 Beta 1 | 10 June 2016 | |
| Thunderbird 52 | 47.0 | 47.0b2 | Thunderbird 47.0 Beta 2 | 17 June 2016 | |
| Thunderbird 52 | 48.0 | 48.0 RC3 | Thunderbird 48.0 Beta 1 | 12 July 2016 | Unreleased version. |
| Thunderbird 52 | 49.0 | 49.0b1 | Thunderbird 49.0 Beta 1 | 2 September 2016 | |
| Thunderbird 52 | 50.0 | 50.0b1 | Thunderbird 50.0 Beta 1 | 8 October 2016 | |
| Thunderbird 52 | 50.0 | 50.0b2 | Thunderbird 50.0 Beta 2 | 17 October 2016 | |
| Thunderbird 52 | 50.0 | 50.0b3 | Thunderbird 50.0 Beta 3 | 28 October 2016 | |
| Thunderbird 52 | 51.0 | 51.0b1 | Thunderbird 51.0 Beta 1 | 11 January 2017 | |
| Thunderbird 52 | 51.0 | 51.0b2 | Thunderbird 51.0 Beta 2 | 18 January 2017 | |
| Thunderbird 52 | 52.0 | 52.0b1 | Thunderbird 52.0 Beta 1 | 27 January 2017 | |
| Thunderbird 52 | 52.0 | 52.0b2 | Thunderbird 52.0 Beta 2 | 10 February 2017 | |
| Thunderbird 52 | 52.0 | 52.0b3 | Thunderbird 52.0 Beta 3 | 15 February 2017 | |
| Thunderbird 52 | 52.0 | 52.0b4 | Thunderbird 52.0 Beta 4 | 24 February 2017 | |
| Thunderbird 52 | 52.0 | 52.0 | Thunderbird 52.0 | 5 April 2017 | |
| Thunderbird 52 | 52.0 | 52.0.1 | Thunderbird 52.0.1 | 14 April 2017 | |
| Thunderbird 52 | 52.0 | 52.1.0 | Thunderbird 52.1.0 | 1 May 2017 | |
| Thunderbird 52 | 52.0 | 52.1.1 | Thunderbird 52.1.1 | 15 May 2017 | |
| Thunderbird 52 | 52.0 | 52.2.0 | Thunderbird 52.2.0 | 14 June 2017 | |
| Thunderbird 52 | 52.0 | 52.2.1 | Thunderbird 52.2.1 | 23 June 2017 | |
| Thunderbird 52 | 52.0 | 52.3.0 | Thunderbird 52.3.0 | 16 August 2017 | |
| Thunderbird 52 | 52.0 | 52.4.0 | Thunderbird 52.4.0 | 6 October 2017 | |
| Thunderbird 52 | 52.0 | 52.5.0 | Thunderbird 52.5.0 | 23 November 2017 | |
| Thunderbird 52 | 52.0 | 52.5.2 | Thunderbird 52.5.2 | 22 December 2017 | |
| Thunderbird 52 | 52.0 | 52.6.0 | Thunderbird 52.6.0 | 25 January 2018 | |
| Thunderbird 52 | 52.0 | 52.7.0 | Thunderbird 52.7.0 | 23 March 2018 | |
| Thunderbird 52 | 52.0 | 52.8.0 | Thunderbird 52.8.0 | 18 May 2018 | |
| Thunderbird 52 | 52.0 | 52.9.0 | Thunderbird 52.9.0 | 3 July 2018 | |
| Thunderbird 52 | 52.0 | 52.9.1 | Thunderbird 52.9.1 | 10 July 2018 | Last release to support Windows XP, Windows Server 2003 (and R2), Windows Server 2008 and Windows Vista. |
| Thunderbird 60 | 53.0 | 53.0b1 | Thunderbird 53.0 Beta 1 | 7 April 2017 | |
| Thunderbird 60 | 53.0 | 53.0b2 | Thunderbird 53.0 Beta 2 | 19 April 2017 | |
| Thunderbird 60 | 54.0 | 54.0b1 | Thunderbird 54.0 Beta 1 | 18 May 2017 | |
| Thunderbird 60 | 54.0 | 54.0b2 | Thunderbird 54.0 Beta 2 | 24 May 2017 | |
| Thunderbird 60 | 54.0 | 54.0b3 | Thunderbird 54.0 Beta 3 | 2 June 2017 | |
| Thunderbird 60 | 55.0 | 55.0b1 | Thunderbird 55.0 Beta 1 | 15 June 2017 | Unreleased first Thunderbird 55.0 beta release. |
| Thunderbird 60 | 55.0 | 55.0b2 | Thunderbird 55.0 Beta 2 | 15 July 2017 | |
| Thunderbird 60 | 56.0 | 56.0b1 | Thunderbird 56.0 Beta 1 | 5 August 2017 | |
| Thunderbird 60 | 56.0 | 56.0b2 | Thunderbird 56.0 Beta 2 | 10 August 2017 | |
| Thunderbird 60 | 56.0 | 56.0b3 | Thunderbird 56.0 Beta 3 | 19 August 2017 | |
| Thunderbird 60 | 56.0 | 56.0b4 | Thunderbird 56.0 Beta 4 | 17 October 2017 | |
| Thunderbird 60 | 57.0 | 57.0b1 | Thunderbird 57.0 Beta 1 | 10 November 2017 | Thunderbird follows Firefox's Quantum design with rectangular tabs and many other changes. |
| Thunderbird 60 | 57.0 | 57.0b2 | Thunderbird 57.0 Beta 2 | 18 November 2017 | |
| Thunderbird 60 | 58.0 | 58.0b1 | Thunderbird 58.0 Beta 1 | 27 November 2017 | |
| Thunderbird 60 | 58.0 | 58.0b2 | Thunderbird 58.0 Beta 2 | 8 December 2017 | |
| Thunderbird 60 | 58.0 | 58.0b3 | Thunderbird 58.0 Beta 3 | 5 January 2018 | |
| Thunderbird 60 | 59.0 | 59.0b1 | Thunderbird 59.0 Beta 1 | 10 February 2018 | |
| Thunderbird 60 | 59.0 | 59.0b2 | Thunderbird 59.0 Beta 2 | 1 March 2018 | |
| Thunderbird 60 | 60.0 | 60.0b1 | Thunderbird 60.0 Beta 1 | 26 March 2018 | |
| Thunderbird 60 | 60.0 | 60.0b2 | Thunderbird 60.0 Beta 2 | 5 April 2018 | |
| Thunderbird 60 | 60.0 | 60.0b3 | Thunderbird 60.0 Beta 3 | 14 April 2018 | |
| Thunderbird 60 | 60.0 | 60.0b4 | Thunderbird 60.0 Beta 4 | 21 April 2018 | |
| Thunderbird 60 | 60.0 | 60.0b5 | Thunderbird 60.0 Beta 5 | 27 April 2018 | |
| Thunderbird 60 | 60.0 | 60.0b6 | Thunderbird 60.0 Beta 6 | 4 May 2018 | Updated Thunderbird's logo. |
| Thunderbird 60 | 60.0 | 60.0b7 | Thunderbird 60.0 Beta 7 | 8 June 2018 | Added support for 64-bit Windows. |
| Thunderbird 60 | 60.0 | 60.0b8 | Thunderbird 60.0 Beta 8 | 21 June 2018 | |
| Thunderbird 60 | 60.0 | 60.0b9 | Thunderbird 60.0 Beta 9 | 26 June 2018 | |
| Thunderbird 60 | 60.0 | 60.0b10 | Thunderbird 60.0 Beta 10 | 10 July 2018 | |
| Thunderbird 60 | 60.0 | 60.0b11 | Thunderbird 60.0 Beta 11 | 4 September 2018 | |
| Thunderbird 60 | 60.0 | 60.0 | Thunderbird 60.0 | 6 August 2018 | Thunderbird follows Firefox' Photon design with rectangular tabs and many other theme changes. Add-ons not marked compatible with Thunderbird 60 disabled. |
| Thunderbird 60 | 60.0 | 60.1.0 rc1 | Thunderbird 60.1.0 RC1 | 12 September 2018 | Unreleased version 60.1.0 release. |
| Thunderbird 60 | 60.0 | 60.2.1 | Thunderbird 60.2.1 | 2 October 2018 | |
| Thunderbird 60 | 60.0 | 60.3.0 | Thunderbird 60.3.0 | 31 October 2018 | |
| Thunderbird 60 | 60.0 | 60.3.1 | Thunderbird 60.3.1 | 15 November 2018 | |
| Thunderbird 60 | 60.0 | 60.3.2 | Thunderbird 60.3.2 | 30 November 2018 | |
| Thunderbird 60 | 60.0 | 60.3.3 | Thunderbird 60.3.3 | 5 December 2018 | |
| Thunderbird 60 | 60.0 | 60.4.0 | Thunderbird 60.4.0 | 20 December 2018 | |
| Thunderbird 60 | 60.0 | 60.5.0 | Thunderbird 60.5.0 | 29 January 2019 | |
| Thunderbird 60 | 60.0 | 60.5.1 | Thunderbird 60.5.1 | 14 February 2019 | |
| Thunderbird 60 | 60.0 | 60.5.2 | Thunderbird 60.5.2 | 25 February 2019 | |
| Thunderbird 60 | 60.0 | 60.5.3 | Thunderbird 60.5.3 | 5 March 2019 | |
| Thunderbird 60 | 60.0 | 60.6.0 | Thunderbird 60.6.0 | 19 March 2019 | |
| Thunderbird 60 | 60.0 | 60.6.1 | Thunderbird 60.6.1 | 25 March 2019 | |
| Thunderbird 60 | 60.0 | 60.7.0 | Thunderbird 60.7.0 | 21 May 2019 | |
| Thunderbird 60 | 60.0 | 60.7.1 | Thunderbird 60.7.1 | 13 June 2019 | |
| Thunderbird 60 | 60.0 | 60.7.2 | Thunderbird 60.7.2 | 20 June 2019 | |
| Thunderbird 60 | 60.0 | 60.8.0 | Thunderbird 60.8.0 | 9 July 2019 | |
| Thunderbird 60 | 60.0 | 60.9.0 | Thunderbird 60.9.0 | 6 September 2019 | |
| Thunderbird 60 | 60.0 | 60.9.1 | Thunderbird 60.9.1 | 5 November 2019 | |
| Thunderbird 68 | 63.0 | 63.0b1 | Thunderbird 63.0 Beta 1 | 11 October 2018 | Non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. |
| Thunderbird 68 | 64.0 | 64.0b1 | Thunderbird 64.0 Beta 1 | 26 October 2018 | |
| Thunderbird 68 | 64.0 | 64.0b2 | Thunderbird 64.0 Beta 2 | 9 November 2018 | |
| Thunderbird 68 | 64.0 | 64.0b3 | Thunderbird 64.0 Beta 3 | 21 November 2018 | |
| Thunderbird 68 | 64.0 | 64.0b4 | Thunderbird 64.0 Beta 4 | 2 December 2018 | |
| Thunderbird 68 | 65.0 | 65.0b1 | Thunderbird 65.0 Beta 1 | 30 December 2018 | |
| Thunderbird 68 | 65.0 | 65.0b2 | Thunderbird 65.0 Beta 2 | 10 January 2019 | |
| Thunderbird 68 | 65.0 | 65.0b3 | Thunderbird 65.0 Beta 3 | 21 January 2019 | |
| Thunderbird 68 | 65.0 | 65.0b4 | Thunderbird 65.0 Beta 4 | 29 January 2019 | |
| Thunderbird 68 | 66.0 | 66.0b1 | Thunderbird 66.0 Beta 1 | 12 February 2019 | |
| Thunderbird 68 | 66.0 | 66.0b2 | Thunderbird 66.0 Beta 2 | 21 February 2019 | |
| Thunderbird 68 | 66.0 | 66.0b3 | Thunderbird 66.0 Beta 3 | 8 March 2019 | |
| Thunderbird 68 | 67.0 | 67.0b1 | Thunderbird 67.0 Beta 1 | 2 April 2019 | |
| Thunderbird 68 | 67.0 | 67.0b2 | Thunderbird 67.0 Beta 2 | 26 April 2019 | |
| Thunderbird 68 | 67.0 | 67.0b3 | Thunderbird 67.0 Beta 3 | 10 May 2019 | |
| Thunderbird 68 | 68.0 | 68.0b1 | Thunderbird 68.0 Beta 1 | 14 June 2019 | Restartless add-ons and non-restartless legacy add-ons using XUL overlays are only supported if add-on authors have adapted them. |
| Thunderbird 68 | 68.0 | 68.0b2 | Thunderbird 68.0 Beta 2 | 24 June 2019 | |
| Thunderbird 68 | 68.0 | 68.0b3 | Thunderbird 68.0 Beta 3 | 1 July 2019 | |
| Thunderbird 68 | 68.0 | 68.0b4 | Thunderbird 68.0 Beta 4 | 8 July 2019 | |
| Thunderbird 68 | 68.0 | 68.0b5 | Thunderbird 68.0 Beta 5 | 18 July 2019 | |
| Thunderbird 68 | 68.0 | 68.0 | Thunderbird 68.0 | 27 August 2019 | |
| Thunderbird 68 | 68.0 | 68.1.0 | Thunderbird 68.1.0 | 11 September 2019 | |
| Thunderbird 68 | 68.0 | 68.1.1 | Thunderbird 68.1.1 | 25 September 2019 | |
| Thunderbird 68 | 68.0 | 68.1.2 | Thunderbird 68.1.2 | 10 October 2019 | |
| Thunderbird 68 | 68.0 | 68.2.0 | Thunderbird 68.2.0 | 22 October 2019 | |
| Thunderbird 68 | 68.0 | 68.2.1 | Thunderbird 68.2.1 | 31 October 2019 | |
| Thunderbird 68 | 68.0 | 68.2.2 | Thunderbird 68.2.2 | 7 November 2019 | |
| Thunderbird 68 | 68.0 | 68.3.0 | Thunderbird 68.3.0 | 3 December 2019 | |
| Thunderbird 68 | 68.0 | 68.3.1 | Thunderbird 68.3.1 | 17 December 2019 | |
| Thunderbird 68 | 68.0 | 68.4.1 | Thunderbird 68.4.1 | 9 January 2020 | |
| Thunderbird 68 | 68.0 | 68.4.2 | Thunderbird 68.4.2 | 24 January 2020 | |
| Thunderbird 68 | 68.0 | 68.5.0 | Thunderbird 68.5.0 | 11 February 2020 | |
| Thunderbird 68 | 68.0 | 68.6.0 | Thunderbird 68.6.0 | 12 March 2020 | |
| Thunderbird 68 | 68.0 | 68.7.0 | Thunderbird 68.7.0 | 8 April 2020 | |
| Thunderbird 68 | 68.0 | 68.8.0 | Thunderbird 68.8.0 | 5 May 2020 | |
| Thunderbird 68 | 68.0 | 68.8.1 | Thunderbird 68.8.1 | 22 May 2020 | |
| Thunderbird 68 | 68.0 | 68.9.0 | Thunderbird 68.9.0 | 3 June 2020 | |
| Thunderbird 68 | 68.0 | 68.10.0 | Thunderbird 68.10.0 | 1 July 2020 | |
| Thunderbird 68 | 68.0 | 68.11.0 | Thunderbird 68.11.0 | 30 July 2020 | |
| Thunderbird 68 | 68.0 | 68.12.0 | Thunderbird 68.12.0 | 25 August 2020 | |
| Thunderbird 68 | 68.0 | 68.12.1 | Thunderbird 68.12.1 | 1 October 2020 | |
| Thunderbird 78 | 69.0 | 69.0b1 | Thunderbird 69.0 Beta 1 | 26 July 2019 | |
| Thunderbird 78 | 69.0 | 69.0b2 | Thunderbird 69.0 Beta 2 | 5 August 2019 | |
| Thunderbird 78 | 69.0 | 69.0b3 | Thunderbird 69.0 Beta 3 | 16 August 2019 | |
| Thunderbird 78 | 69.0 | 69.0b4 | Thunderbird 69.0 Beta 4 | 28 August 2019 | |
| Thunderbird 78 | 70.0 | 70.0b1 | Thunderbird 70.0 Beta 1 | 11 September 2019 | |
| Thunderbird 78 | 70.0 | 70.0b2 | Thunderbird 70.0 Beta 2 | 22 September 2019 | |
| Thunderbird 78 | 70.0 | 70.0b3 | Thunderbird 70.0 Beta 3 | 4 October 2019 | |
| Thunderbird 78 | 70.0 | 70.0b4 | Thunderbird 70.0 Beta 4 | 17 October 2019 | |
| Thunderbird 78 | 71.0 | 71.0b1 | Thunderbird 71.0 Beta 1 | 24 October 2019 | |
| Thunderbird 78 | 71.0 | 71.0b2 | Thunderbird 71.0 Beta 2 | 31 October 2019 | |
| Thunderbird 78 | 71.0 | 71.0b3 | Thunderbird 71.0 Beta 3 | 18 November 2019 | |
| Thunderbird 78 | 71.0 | 71.0b4 | Thunderbird 71.0 Beta 4 | 28 November 2019 | |
| Thunderbird 78 | 72.0 | 72.0b1 | Thunderbird 72.0 Beta 1 | 4 December 2019 | |
| Thunderbird 78 | 72.0 | 72.0b2 | Thunderbird 72.0 Beta 2 | 13 December 2019 | |
| Thunderbird 78 | 72.0 | 72.0b3 | Thunderbird 72.0 Beta 3 | 3 January 2020 | |
| Thunderbird 78 | 73.0 | 73.0b1 | Thunderbird 73.0 Beta 1 | 17 January 2020 | |
| Thunderbird 78 | 73.0 | 73.0b2 | Thunderbird 73.0 Beta 2 | 31 January 2020 | |
| Thunderbird 78 | 74.0 | 74.0b1 | Thunderbird 74.0 Beta 1 | 17 February 2020 | Add-ons are no longer supported, except for MailExtensions. |
| Thunderbird 78 | 74.0 | 74.0b2 | Thunderbird 74.0 Beta 2 | 28 February 2020 | |
| Thunderbird 78 | 75.0 | 75.0b1 | Thunderbird 75.0 Beta 1 | 13 March 2020 | |
| Thunderbird 78 | 75.0 | 75.0b2 | Thunderbird 75.0 Beta 2 | 26 March 2020 | |
| Thunderbird 78 | 75.0 | 75.0b3 | Thunderbird 75.0 Beta 3 | 1 April 2020 | |
| Thunderbird 78 | 76.0 | 76.0b1 | Thunderbird 76.0 Beta 1 | 9 April 2020 | |
| Thunderbird 78 | 76.0 | 76.0b2 | Thunderbird 76.0 Beta 2 | 22 April 2020 | |
| Thunderbird 78 | 76.0 | 76.0b3 | Thunderbird 76.0 Beta 3 | 29 April 2020 | |
| Thunderbird 78 | 77.0 | 77.0b1 | Thunderbird 77.0 Beta 1 | 7 May 2020 | |
| Thunderbird 78 | 77.0 | 77.0b2 | Thunderbird 77.0 Beta 2 | 11 May 2020 | |
| Thunderbird 78 | 77.0 | 77.0b3 | Thunderbird 77.0 Beta 3 | 19 May 2020 | |
| Thunderbird 78 | 78.0 | 78.0b1 | Thunderbird 78.0 Beta 1 | 11 June 2020 | |
| Thunderbird 78 | 78.0 | 78.0b2 | Thunderbird 78.0 Beta 2 | 16 June 2020 | |
| Thunderbird 78 | 78.0 | 78.0b3 | Thunderbird 78.0 Beta 3 | 23 June 2020 | |
| Thunderbird 78 | 78.0 | 78.0b4 | Thunderbird 78.0 Beta 4 | 30 June 2020 | |
| Thunderbird 78 | 78.0 | 78.0 | Thunderbird 78.0 | 17 July 2020 | Add-ons are no longer supported, except for MailExtensions. |
| Thunderbird 78 | 78.0 | 78.0.1 | Thunderbird 78.0.1 | 21 July 2020 | |
| Thunderbird 78 | 78.0 | 78.1.0 | Thunderbird 78.1.0 | 30 July 2020 | |
| Thunderbird 78 | 78.0 | 78.1.1 | Thunderbird 78.1.1 | 6 August 2020 | |
| Thunderbird 78 | 78.0 | 78.2.0 | Thunderbird 78.2.0 | 25 August 2020 | |
| Thunderbird 78 | 78.0 | 78.2.1 | Thunderbird 78.2.1 | 29 August 2020 | OpenPGP enabled by default. |
| Thunderbird 78 | 78.0 | 78.2.2 | Thunderbird 78.2.2 | 10 September 2020 | |
| Thunderbird 78 | 78.0 | 78.3.0 | Thunderbird 78.3.0 | 24 September 2020 | |
| Thunderbird 78 | 78.0 | 78.3.1 | Thunderbird 78.3.1 | 26 September 2020 | |
| Thunderbird 78 | 78.0 | 78.3.2 | Thunderbird 78.3.2 | 7 October 2020 | |
| Thunderbird 78 | 78.0 | 78.3.3 | Thunderbird 78.3.3 | 16 October 2020 | |
| Thunderbird 78 | 78.0 | 78.4.0 | Thunderbird 78.4.0 | 20 October 2020 | |
| Thunderbird 78 | 78.0 | 78.4.1 | Thunderbird 78.4.1 | 6 November 2020 | |
| Thunderbird 78 | 78.0 | 78.4.2 | Thunderbird 78.4.2 | 9 November 2020 | |
| Thunderbird 78 | 78.0 | 78.4.3 | Thunderbird 78.4.3 | 11 November 2020 | |
| Thunderbird 78 | 78.0 | 78.5.0 | Thunderbird 78.5.0 | 17 November 2020 | |
| Thunderbird 78 | 78.0 | 78.5.1 | Thunderbird 78.5.1 | 2 December 2020 | |
| Thunderbird 78 | 78.0 | 78.6.0 | Thunderbird 78.6.0 | 15 December 2020 | |
| Thunderbird 78 | 78.0 | 78.6.1 | Thunderbird 78.6.1 | 11 January 2021 | |
| Thunderbird 78 | 78.0 | 78.7.0 | Thunderbird 78.7.0 | 26 January 2021 | |
| Thunderbird 78 | 78.0 | 78.7.1 | Thunderbird 78.7.1 | 5 February 2021 | CardDAV address books now support OAuth2 and Google Contacts. Thunderbird will no longer allow installation of addons that use the legacy API. |
| Thunderbird 78 | 78.0 | 78.8.0 | Thunderbird 78.8.0 | 23 February 2021 | |
| Thunderbird 78 | 78.0 | 78.8.1 | Thunderbird 78.8.1 | 8 March 2021 | |
| Thunderbird 78 | 78.0 | 78.9.0 | Thunderbird 78.9.0 | 23 March 2021 | |
| Thunderbird 78 | 78.0 | 78.9.1 | Thunderbird 78.9.1 | 8 April 2021 | |
| Thunderbird 78 | 78.0 | 78.10.0 | Thunderbird 78.10.0 | 19 April 2021 | |
| Thunderbird 78 | 78.0 | 78.10.1 | Thunderbird 78.10.1 | 4 May 2021 | |
| Thunderbird 78 | 78.0 | 78.10.2 | Thunderbird 78.10.2 | 17 May 2021 | |
| Thunderbird 78 | 78.0 | 78.11.0 | Thunderbird 78.11.0 | 2 June 2021 | |
| Thunderbird 78 | 78.0 | 78.12.0 | Thunderbird 78.12.0 | 13 July 2021 | |
| Thunderbird 78 | 78.0 | 78.13.0 | Thunderbird 78.13.0 | 10 August 2021 | |
| Thunderbird 78 | 78.0 | 78.14.0 | Thunderbird 78.14.0 | 7 September 2021 | Last 78.0 release. 78.15.0, which was scheduled on 5 or 6 October 2021, was canceled. Last release to support OS X 10.9-10.11. |
| Thunderbird 91 | 79.0 | 79.0b1 | Thunderbird 79.0 Beta 1 | 16 July 2020 | |
| Thunderbird 91 | 79.0 | 79.0b2 | Thunderbird 79.0 Beta 2 | 21 July 2020 | |
| Thunderbird 91 | 79.0 | 79.0b3 | Thunderbird 79.0 Beta 3 | 27 July 2020 | |
| Thunderbird 91 | 80.0 | 80.0b1 | Thunderbird 80.0 Beta 1 | 3 August 2020 | |
| Thunderbird 91 | 80.0 | 80.0b2 | Thunderbird 80.0 Beta 2 | 10 August 2020 | |
| Thunderbird 91 | 80.0 | 80.0b3 | Thunderbird 80.0 Beta 3 | 11 August 2020 | |
| Thunderbird 91 | 80.0 | 80.0b4 | Thunderbird 80.0 Beta 4 | 17 August 2020 | |
| Thunderbird 91 | 80.0 | 80.0b5 | Thunderbird 80.0 Beta 5 | 20 August 2020 | |
| Thunderbird 91 | 81.0 | 81.0b1 | Thunderbird 81.0 Beta 1 | 26 August 2020 | |
| Thunderbird 91 | 81.0 | 81.0b2 | Thunderbird 81.0 Beta 2 | 29 August 2020 | OpenPGP enabled by default. |
| Thunderbird 91 | 81.0 | 81.0b3 | Thunderbird 81.0 Beta 3 | 8 September 2020 | |
| Thunderbird 91 | 81.0 | 81.0b4 | Thunderbird 81.0 Beta 4 | 16 September 2020 | |
| Thunderbird 91 | 82.0 | 82.0b1 | Thunderbird 82.0 Beta 1 | 25 September 2020 | |
| Thunderbird 91 | 82.0 | 82.0b2 | Thunderbird 82.0 Beta 2 | 1 October 2020 | |
| Thunderbird 91 | 82.0 | 82.0b3 | Thunderbird 82.0 Beta 3 | 16 October 2020 | |
| Thunderbird 91 | 83.0 | 83.0b1 | Thunderbird 83.0 Beta 1 | 22 October 2020 | |
| Thunderbird 91 | 83.0 | 83.0b2 | Thunderbird 83.0 Beta 2 | 3 November 2020 | |
| Thunderbird 91 | 83.0 | 83.0b3 | Thunderbird 83.0 Beta 3 | 9 November 2020 | |
| Thunderbird 91 | 84.0 | 84.0b1 | Thunderbird 84.0 Beta 1 | 18 November 2020 | |
| Thunderbird 91 | 84.0 | 84.0b2 | Thunderbird 84.0 Beta 2 | 24 November 2020 | |
| Thunderbird 91 | 84.0 | 84.0b3 | Thunderbird 84.0 Beta 3 | 4 December 2020 | |
| Thunderbird 91 | 85.0 | 85.0b1 | Thunderbird 85.0 Beta 1 | 18 December 2020 | |
| Thunderbird 91 | 85.0 | 85.0b2 | Thunderbird 85.0 Beta 2 | 23 December 2020 | |
| Thunderbird 91 | 85.0 | 85.0b3 | Thunderbird 85.0 Beta 3 | 4 January 2021 | |
| Thunderbird 91 | 86.0 | 86.0b1 | Thunderbird 86.0 Beta 1 | 29 January 2021 | |
| Thunderbird 91 | 86.0 | 86.0b2 | Thunderbird 86.0 Beta 2 | 8 February 2021 | |
| Thunderbird 91 | 86.0 | 86.0b3 | Thunderbird 86.0 Beta 3 | 16 February 2021 | |
| Thunderbird 91 | 87.0 | 87.0b1 | Thunderbird 87.0 Beta 1 | 26 February 2021 | |
| Thunderbird 91 | 87.0 | 87.0b2 | Thunderbird 87.0 Beta 2 | 3 March 2021 | |
| Thunderbird 91 | 88.0 | 88.0b1 | Thunderbird 88.0 Beta 1 | 26 March 2021 | |
| Thunderbird 91 | 88.0 | 88.0b2 | Thunderbird 88.0 Beta 2 | 2 April 2021 | |
| Thunderbird 91 | 88.0 | 88.0b3 | Thunderbird 88.0 Beta 3 | 14 April 2021 | |
| Thunderbird 91 | 89.0 | 89.0b1 | Thunderbird 89.0 Beta 1 | 21 April 2021 | |
| Thunderbird 91 | 89.0 | 89.0b2 | Thunderbird 89.0 Beta 2 | 29 April 2021 | |
| Thunderbird 91 | 89.0 | 89.0b3 | Thunderbird 89.0 Beta 3 | 6 May 2021 | |
| Thunderbird 91 | 89.0 | 89.0b4 | Thunderbird 89.0 Beta 4 | 13 May 2021 | |
| Thunderbird 91 | 90.0 | 90.0b1 | Thunderbird 90.0 Beta 1 | 2 June 2021 | |
| Thunderbird 91 | 90.0 | 90.0b2 | Thunderbird 90.0 Beta 2 | 17 June 2021 | |
| Thunderbird 91 | 90.0 | 90.0b3 | Thunderbird 90.0 Beta 3 | 29 June 2021 | |
| Thunderbird 91 | 91.0 | 91.0b1 | Thunderbird 91.0 Beta 1 | 13 July 2021 | |
| Thunderbird 91 | 91.0 | 91.0b2 | Thunderbird 91.0 Beta 2 | 20 July 2021 | |
| Thunderbird 91 | 91.0 | 91.0b3 | Thunderbird 91.0 Beta 3 | 22 July 2021 | |
| Thunderbird 91 | 91.0 | 91.0b4 | Thunderbird 91.0 Beta 4 | 26 July 2021 | |
| Thunderbird 91 | 91.0 | 91.0b5 | Thunderbird 91.0 Beta 5 | 29 July 2021 | |
| Thunderbird 91 | 91.0 | 91.0b6 | Thunderbird 91.0 Beta 6 | 3 August 2021 | |
| Thunderbird 91 | 91.0 | 91.0 | Thunderbird 91.0 | 11 August 2021 | |
| Thunderbird 91 | 91.0 | 91.0.1 | Thunderbird 91.0.1 | 17 August 2021 | |
| Thunderbird 91 | 91.0 | 91.0.2 | Thunderbird 91.0.2 | 20 August 2021 | |
| Thunderbird 91 | 91.0 | 91.0.3 | Thunderbird 91.0.3 | 26 August 2021 | |
| Thunderbird 91 | 91.0 | 91.1.0 | Thunderbird 91.1.0 | 7 September 2021 | |
| Thunderbird 91 | 91.0 | 91.1.1 | Thunderbird 91.1.1 | 16 September 2021 | |
| Thunderbird 91 | 91.0 | 91.1.2 | Thunderbird 91.1.2 | 27 September 2021 | |
| Thunderbird 91 | 91.0 | 91.2.0 | Thunderbird 91.2.0 | 5 October 2021 | |
| Thunderbird 91 | 91.0 | 91.2.1 | Thunderbird 91.2.1 | 21 October 2021 | |
| Thunderbird 91 | 91.0 | 91.3.0 | Thunderbird 91.3.0 | 3 November 2021 | |
| Thunderbird 91 | 91.0 | 91.3.1 | Thunderbird 91.3.1 | 15 November 2021 | |
| Thunderbird 91 | 91.0 | 91.3.2 | Thunderbird 91.3.2 | 19 November 2021 | |
| Thunderbird 91 | 91.0 | 91.4.0 | Thunderbird 91.4.0 | 7 December 2021 | |
| Thunderbird 91 | 91.0 | 91.4.1 | Thunderbird 91.4.1 | 17 December 2021 | |
| Thunderbird 91 | 91.0 | 91.5.0 | Thunderbird 91.5.0 | 11 January 2022 | |
| Thunderbird 91 | 91.0 | 91.5.1 | Thunderbird 91.5.1 | 24 January 2022 | |
| Thunderbird 91 | 91.0 | 91.6.0 | Thunderbird 91.6.0 | 8 February 2022 | |
| Thunderbird 91 | 91.0 | 91.6.1 | Thunderbird 91.6.1 | 15 February 2022 | |
| Thunderbird 91 | 91.0 | 91.6.2 | Thunderbird 91.6.2 | 5 March 2022 | |
| Thunderbird 91 | 91.0 | 91.7.0 | Thunderbird 91.7.0 | 8 March 2022 | |
| Thunderbird 91 | 91.0 | 91.8.0 | Thunderbird 91.8.0 | 5 April 2022 | Google accounts using password authentication are migrated to OAuth2 starting from this release. |
| Thunderbird 91 | 91.0 | 91.8.1 | Thunderbird 91.8.1 | 18 April 2022 | |
| Thunderbird 91 | 91.0 | 91.9.0 | Thunderbird 91.9.0 | 3 May 2022 | |
| Thunderbird 91 | 91.0 | 91.9.1 | Thunderbird 91.9.1 | 20 May 2022 | |
| Thunderbird 91 | 91.0 | 91.10.0 | Thunderbird 91.10.0 | 31 May 2022 | |
| Thunderbird 91 | 91.0 | 91.11.0 | Thunderbird 91.11.0 | 28 June 2022 | |
| Thunderbird 91 | 91.0 | 91.12.0 | Thunderbird 91.12.0 | 26 July 2022 | |
| Thunderbird 91 | 91.0 | 91.13.0 | Thunderbird 91.13.0 | 23 August 2022 | |
| Thunderbird 91 | 91.0 | 91.13.1 | Thunderbird 91.13.1 | 19 September 2022 | Security patches backported from 102.2.1. It is the final release of Thunderbird 91. |
| Thunderbird 102 | 92.0 | 92.0b1 | Thunderbird 92.0 Beta 1 | 13 August 2021 | |
| Thunderbird 102 | 92.0 | 92.0b2 | Thunderbird 92.0 Beta 2 | 16 August 2021 | |
| Thunderbird 102 | 92.0 | 92.0b3 | Thunderbird 92.0 Beta 3 | 23 August 2021 | |
| Thunderbird 102 | 92.0 | 92.0b4 | Thunderbird 92.0 Beta 4 | 26 August 2021 | |
| Thunderbird 102 | 92.0 | 92.0b5 | Thunderbird 92.0 Beta 5 | 2 September 2021 | |
| Thunderbird 102 | 93.0 | 93.0b1 | Thunderbird 93.0 Beta 1 | 9 September 2021 | |
| Thunderbird 102 | 93.0 | 93.0b2 | Thunderbird 93.0 Beta 2 | 13 September 2021 | |
| Thunderbird 102 | 93.0 | 93.0b3 | Thunderbird 93.0 Beta 3 | 21 September 2021 | |
| Thunderbird 102 | 93.0 | 93.0b4 | Thunderbird 93.0 Beta 4 | 24 September 2021 | |
| Thunderbird 102 | 93.0 | 93.0b5 | Thunderbird 93.0 Beta 5 | 28 September 2021 | |
| Thunderbird 102 | 94.0 | 94.0b1 | Thunderbird 94.0 Beta 1 | 5 October 2021 | |
| Thunderbird 102 | 94.0 | 94.0b2 | Thunderbird 94.0 Beta 2 | 9 October 2021 | |
| Thunderbird 102 | 94.0 | 94.0b3 | Thunderbird 94.0 Beta 3 | 15 October 2021 | |
| Thunderbird 102 | 94.0 | 94.0b4 | Thunderbird 94.0 Beta 4 | 21 October 2021 | |
| Thunderbird 102 | 94.0 | 94.0b5 | Thunderbird 94.0 Beta 5 | 28 October 2021 | |
| Thunderbird 102 | 95.0 | 95.0b1 | Thunderbird 95.0 Beta 1 | 3 November 2021 | |
| Thunderbird 102 | 95.0 | 95.0b2 | Thunderbird 95.0 Beta 2 | 9 November 2021 | |
| Thunderbird 102 | 95.0 | 95.0b3 | Thunderbird 95.0 Beta 3 | 13 November 2021 | |
| Thunderbird 102 | 95.0 | 95.0b4 | Thunderbird 95.0 Beta 4 | 23 November 2021 | |
| Thunderbird 102 | 95.0 | 95.0b5 | Thunderbird 95.0 Beta 5 | 29 November 2021 | |
| Thunderbird 102 | 96.0 | 96.0b1 | Thunderbird 96.0 Beta 1 | 7 December 2021 | |
| Thunderbird 102 | 96.0 | 96.0b2 | Thunderbird 96.0 Beta 2 | 13 December 2021 | |
| Thunderbird 102 | 96.0 | 96.0b3 | Thunderbird 96.0 Beta 3 | 20 December 2021 | |
| Thunderbird 102 | 96.0 | 96.0b4 | Thunderbird 96.0 Beta 4 | 4 January 2022 | |
| Thunderbird 102 | 97.0 | 97.0b1 | Thunderbird 97.0 Beta 1 | 11 January 2022 | |
| Thunderbird 102 | 97.0 | 97.0b2 | Thunderbird 97.0 Beta 2 | 17 January 2022 | |
| Thunderbird 102 | 97.0 | 97.0b3 | Thunderbird 97.0 Beta 3 | 24 January 2022 | |
| Thunderbird 102 | 98.0 | 98.0b1 | Thunderbird 98.0 Beta 1 | 9 February 2022 | |
| Thunderbird 102 | 98.0 | 98.0b2 | Thunderbird 98.0 Beta 2 | 14 February 2022 | |
| Thunderbird 102 | 98.0 | 98.0b3 | Thunderbird 98.0 Beta 3 | 1 March 2022 | |
| Thunderbird 102 | 99.0 | 99.0b1 | Thunderbird 99.0 Beta 1 | 10 March 2022 | |
| Thunderbird 102 | 99.0 | 99.0b2 | Thunderbird 99.0 Beta 2 | 21 March 2022 | |
| Thunderbird 102 | 100.0 | 100.0b1 | Thunderbird 100.0 Beta 1 | 6 April 2022 | |
| Thunderbird 102 | 100.0 | 100.0b2 | Thunderbird 100.0 Beta 2 | 11 April 2022 | |
| Thunderbird 102 | 100.0 | 100.0b3 | Thunderbird 100.0 Beta 3 | 19 April 2022 | |
| Thunderbird 102 | 100.0 | 100.0b4 | Thunderbird 100.0 Beta 4 | 26 April 2022 | |
| Thunderbird 102 | 101.0 | 101.0b1 | Thunderbird 101.0 Beta 1 | 4 May 2022 | |
| Thunderbird 102 | 101.0 | 101.0b2 | Thunderbird 101.0 Beta 2 | 12 May 2022 | |
| Thunderbird 102 | 101.0 | 101.0b3 | Thunderbird 101.0 Beta 3 | 17 May 2022 | |
| Thunderbird 102 | 101.0 | 101.0b4 | Thunderbird 101.0 Beta 4 | 20 May 2022 | |
| Thunderbird 102 | 102.0 | 102.0b1 | Thunderbird 102.0 Beta 1 | 1 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b2 | Thunderbird 102.0 Beta 2 | 3 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b3 | Thunderbird 102.0 Beta 3 | 6 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b4 | Thunderbird 102.0 Beta 4 | 9 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b5 | Thunderbird 102.0 Beta 5 | 14 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b6 | Thunderbird 102.0 Beta 6 | 16 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b7 | Thunderbird 102.0 Lucky Beta 7 | 18 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0b8 | Thunderbird 102.0 Super Beta 8 | 22 June 2022 | |
| Thunderbird 102 | 102.0 | 102.0 | Thunderbird 102.0 | 29 June 2022 | OpenPGP improvements, OAuth2 support for Google Talk, initial support for matrix protocol. |
| Thunderbird 102 | 102.0 | 102.0.1 | Thunderbird 102.0.1 | 5 July 2022 | |
| Thunderbird 102 | 102.0 | 102.0.2 | Thunderbird 102.0.2 | 12 July 2022 | |
| Thunderbird 102 | 102.0 | 102.0.3 | Thunderbird 102.0.3 | 20 July 2022 | |
| Thunderbird 102 | 102.0 | 102.1.0 | Thunderbird 102.1.0 | 26 July 2022 | |
| Thunderbird 102 | 102.0 | 102.1.1 | Thunderbird 102.1.1 | 8 August 2022 | |
| Thunderbird 102 | 102.0 | 102.1.2 | Thunderbird 102.1.2 | 9 August 2022 | |
| Thunderbird 102 | 102.0 | 102.2.0 | Thunderbird 102.2.0 | 23 August 2022 | |
| Thunderbird 102 | 102.0 | 102.2.1 | Thunderbird 102.2.1 | 1 September 2022 | |
| Thunderbird 102 | 102.0 | 102.2.2 | Thunderbird 102.2.2 | 7 September 2022 | |
| Thunderbird 102 | 102.0 | 102.3.0 | Thunderbird 102.3.0 | 20 September 2022 | |
| Thunderbird 102 | 102.0 | 102.3.1 | Thunderbird 102.3.1 | 28 September 2022 | |
| Thunderbird 102 | 102.0 | 102.3.2 | Thunderbird 102.3.2 | 7 October 2022 | |
| Thunderbird 102 | 102.0 | 102.3.3 | Thunderbird 102.3.3 | 12 October 2022 | |
| Thunderbird 102 | 102.0 | 102.4.0 | Thunderbird 102.4.0 | 19 October 2022 | |
| Thunderbird 102 | 102.0 | 102.4.1 | Thunderbird 102.4.1 | 26 October 2022 | |
| Thunderbird 102 | 102.0 | 102.4.2 | Thunderbird 102.4.2 | 4 November 2022 | |
| Thunderbird 102 | 102.0 | 102.5.0 | Thunderbird 102.5.0 | 15 November 2022 | |
| Thunderbird 102 | 102.0 | 102.5.1 | Thunderbird 102.5.1 | 1 December 2022 | |
| Thunderbird 102 | 102.0 | 102.6.0 | Thunderbird 102.6.0 | 13 December 2022 | |
| Thunderbird 102 | 102.0 | 102.6.1 | Thunderbird 102.6.1 | 20 December 2022 | |
| Thunderbird 102 | 102.0 | 102.7.0 | Thunderbird 102.7.0 | 19 January 2023 | |
| Thunderbird 102 | 102.0 | 102.7.1 | Thunderbird 102.7.1 | 1 February 2023 | |
| Thunderbird 102 | 102.0 | 102.7.2 | Thunderbird 102.7.2 | 7 February 2023 | |
| Thunderbird 102 | 102.0 | 102.8.0 | Thunderbird 102.8.0 | 15 February 2023 | |
| Thunderbird 102 | 102.0 | 102.9.0 | Thunderbird 102.9.0 | 14 March 2023 | |
| Thunderbird 102 | 102.0 | 102.9.1 | Thunderbird 102.9.1 | 28 March 2023 | |
| Thunderbird 102 | 102.0 | 102.10.0 | Thunderbird 102.10.0 | 11 April 2023 | |
| Thunderbird 102 | 102.0 | 102.10.1 | Thunderbird 102.10.1 | 24 April 2023 | |
| Thunderbird 102 | 102.0 | 102.11.0 | Thunderbird 102.11.0 | 10 May 2023 | |
| Thunderbird 102 | 102.0 | 102.11.1 | Thunderbird 102.11.1 | 25 May 2023 | |
| Thunderbird 102 | 102.0 | 102.11.2 | Thunderbird 102.11.2 | 27 May 2023 | Contains fixes for POP3 client regressions first present in version 102.11.1. |
| Thunderbird 102 | 102.0 | 102.12.0 | Thunderbird 102.12.0 | 7 June 2023 | |
| Thunderbird 102 | 102.0 | 102.13.0 | Thunderbird 102.13.0 | 5 July 2023 | |
| Thunderbird 102 | 102.0 | 102.13.1 | Thunderbird 102.13.1 | 26 July 2023 | |
| Thunderbird 102 | 102.0 | 102.14.0 | Thunderbird 102.14.0 | 2 August 2023 | |
| Thunderbird 102 | 102.0 | 102.15.0 | Thunderbird 102.15.0 | 30 August 2023 | |
| Thunderbird 102 | 102.0 | 102.15.1 | Thunderbird 102.15.1 | 12 September 2023 | Final release of Thunderbird 102. Upgrade is available starting with version 115.2.3. |
| Thunderbird 115 | 103.0 | 103.0b1 | Thunderbird 103.0 Beta 1 | 29 June 2022 | |
| Thunderbird 115 | 103.0 | 103.0b2 | Thunderbird 103.0 Beta 2 | 1 July 2022 | |
| Thunderbird 115 | 103.0 | 103.0b3 | Thunderbird 103.0 Beta 3 | 6 July 2022 | |
| Thunderbird 115 | 103.0 | 103.0b4 | Thunderbird 103.0 Beta 4 | 8 July 2022 | |
| Thunderbird 115 | 103.0 | 103.0b5 | Thunderbird 103.0 Beta 5 | 13 July 2022 | |
| Thunderbird 115 | 103.0 | 103.0b6 | Thunderbird 103.0 Beta 6 | 19 July 2022 | |
| Thunderbird 115 | 104.0 | 104.0b1 | Thunderbird 104.0 Beta 1 | 27 July 2022 | |
| Thunderbird 115 | 104.0 | 104.0b2 | Thunderbird 104.0 Beta 2 | 2 August 2022 | |
| Thunderbird 115 | 104.0 | 104.0b3 | Thunderbird 104.0 Beta 3 | 10 August 2022 | |
| Thunderbird 115 | 104.0 | 104.0b4 | Thunderbird 104.0 Beta 4 | 16 August 2022 | |
| Thunderbird 115 | 105.0 | 105.0b1 | Thunderbird 105.0 Beta 1 | 24 August 2022 | |
| Thunderbird 115 | 105.0 | 105.0b2 | Thunderbird 105.0 Beta 2 | 1 September 2022 | |
| Thunderbird 115 | 105.0 | 105.0b3 | Thunderbird 105.0 Beta 3 | 6 September 2022 | |
| Thunderbird 115 | 105.0 | 105.0b4 | Thunderbird 105.0 Beta 4 | 13 September 2022 | |
| Thunderbird 115 | 106.0 | 106.0b1 | Thunderbird 106.0 Beta 1 | 21 September 2022 | |
| Thunderbird 115 | 106.0 | 106.0b2 | Thunderbird 106.0 Beta 2 | 27 September 2022 | |
| Thunderbird 115 | 106.0 | 106.0b3 | Thunderbird 106.0 Beta 3 | 28 September 2022 | |
| Thunderbird 115 | 106.0 | 106.0b4 | Thunderbird 106.0 Beta 4 | 3 October 2022 | |
| Thunderbird 115 | 106.0 | 106.0b5 | Thunderbird 106.0 Beta 5 | 10 October 2022 | |
| Thunderbird 115 | 107.0 | 107.0b1 | Thunderbird 107.0 Beta 1 | 19 October 2022 | |
| Thunderbird 115 | 107.0 | 107.0b2 | Thunderbird 107.0 Beta 2 | 24 October 2022 | |
| Thunderbird 115 | 107.0 | 107.0b3 | Thunderbird 107.0 Beta 3 | 31 October 2022 | |
| Thunderbird 115 | 107.0 | 107.0b4 | Thunderbird 107.0 Beta 4 | 7 November 2022 | |
| Thunderbird 115 | 108.0 | 108.0b1 | Thunderbird 108.0 Beta 1 | 15 November 2022 | |
| Thunderbird 115 | 108.0 | 108.0b2 | Thunderbird 108.0 Beta 2 | 29 November 2022 | |
| Thunderbird 115 | 108.0 | 108.0b3 | Thunderbird 108.0 Beta 3 | 5 December 2022 | |
| Thunderbird 115 | 109.0 | 109.0b1 | Thunderbird 109.0 Beta 1 | 14 December 2022 | |
| Thunderbird 115 | 109.0 | 109.0b2 | Thunderbird 109.0 Beta 2 | 19 December 2022 | |
| Thunderbird 115 | 109.0 | 109.0b3 | Thunderbird 109.0 Beta 3 | 4 January 2023 | |
| Thunderbird 115 | 109.0 | 109.0b4 | Thunderbird 109.0 Beta 4 | 9 January 2023 | |
| Thunderbird 115 | 110.0 | 110.0b1 | Thunderbird 110.0 Beta 1 | 19 January 2023 | |
| Thunderbird 115 | 110.0 | 110.0b2 | Thunderbird 110.0 Beta 2 | 24 January 2023 | |
| Thunderbird 115 | 110.0 | 110.0b3 | Thunderbird 110.0 Beta 3 | 31 January 2023 | |
| Thunderbird 115 | 110.0 | 110.0b4 | Thunderbird 110.0 Beta 4 | 7 February 2023 | |
| Thunderbird 115 | 111.0 | 111.0b1 | Thunderbird 111.0 Beta 1 | 27 February 2023 | Initial version of Supernova UI. |
| Thunderbird 115 | 111.0 | 111.0b2 | Thunderbird 111.0 Beta 2 | 1 March 2023 | |
| Thunderbird 115 | 111.0 | 111.0b3 | Thunderbird 111.0 Beta 3 | 7 March 2023 | |
| Thunderbird 115 | 111.0 | 111.0b4 RC1 | Thunderbird 111.0 Beta 4 | 8 March 2023 | Unreleased beta version. |
| Thunderbird 115 | 112.0 | 112.0b1 | Thunderbird 112.0 Beta 1 | 15 March 2023 | |
| Thunderbird 115 | 112.0 | 112.0b2 | Thunderbird 112.0 Beta 2 | 21 March 2023 | |
| Thunderbird 115 | 112.0 | 112.0b3 | Thunderbird 112.0 Beta 3 | 23 March 2023 | |
| Thunderbird 115 | 112.0 | 112.0b4 | Thunderbird 112.0 Beta 4 | 27 March 2023 | |
| Thunderbird 115 | 112.0 | 112.0b5 | Thunderbird 112.0 Beta 5 | 29 March 2023 | |
| Thunderbird 115 | 112.0 | 112.0b6 | Thunderbird 112.0 Beta 6 | 3 April 2023 | |
| Thunderbird 115 | 112.0 | 112.0b7 | Thunderbird 112.0 Beta 7 | 5 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b1 | Thunderbird 113.0 Beta 1 | 11 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b2 | Thunderbird 113.0 Beta 2 | 18 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b3 | Thunderbird 113.0 Beta 3 | 20 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b4 | Thunderbird 113.0 Beta 4 | 24 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b5 | Thunderbird 113.0 Beta 5 | 26 April 2023 | |
| Thunderbird 115 | 113.0 | 113.0b6 | Thunderbird 113.0 Beta 6 | 3 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b1 | Thunderbird 114.0 Beta 1 | 12 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b2 | Thunderbird 114.0 Beta 2 | 16 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b3 | Thunderbird 114.0 Beta 3 | 17 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b4 | Thunderbird 114.0 Beta 4 | 24 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b5 | Thunderbird 114.0 Beta 5 | 25 May 2023 | |
| Thunderbird 115 | 114.0 | 114.0b6 | Thunderbird 114.0 Beta 6 | 31 May 2023 | |
| Thunderbird 115 | 115.0 | 115.0b1 | Thunderbird 115.0 Beta 1 | 8 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0b2 | Thunderbird 115.0 Beta 2 | 14 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0b3 | Thunderbird 115.0 Beta 3 | 15 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0b4 | Thunderbird 115.0 Beta 4 | 21 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0b5 | Thunderbird 115.0 Beta 5 | 27 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0b6 | Thunderbird 115.0 Beta 6 | 29 June 2023 | |
| Thunderbird 115 | 115.0 | 115.0 | Thunderbird 115.0 "SuperNova" | 11 July 2023 | New visual appearance, called Supernova UI, various OpenPGP improvements OAuth2 support for Fastmail, various bug fixes. Only available as direct download. Thunderbird's logo is also updated starting from this release. |
| Thunderbird 115 | 115.0 | 115.0.1 | Thunderbird 115.0.1 "SuperNova" | 20 July 2023 | |
| Thunderbird 115 | 115.0 | 115.1.0 | Thunderbird 115.1.0 "SuperNova" | 1 August 2023 | |
| Thunderbird 115 | 115.0 | 115.1.1 | Thunderbird 115.1.1 "SuperNova" | 15 August 2023 | |
| Thunderbird 115 | 115.0 | 115.2.0 | Thunderbird 115.2.0 "SuperNova" | 30 August 2023 | |
| Thunderbird 115 | 115.0 | 115.2.1 | Thunderbird 115.2.1 "SuperNova" | 11 September 2023 | |
| Thunderbird 115 | 115.0 | 115.2.2 | Thunderbird 115.2.2 "SuperNova" | 12 September 2023 | |
| Thunderbird 115 | 115.0 | 115.2.3 | Thunderbird 115.2.3 "SuperNova" | 20 September 2023 | |
| Thunderbird 115 | 115.0 | 115.3.0 | Thunderbird 115.3.0 "SuperNova" | 26 September 2023 | |
| Thunderbird 115 | 115.0 | 115.3.1 | Thunderbird 115.3.1 "SuperNova" | 29 September 2023 | |
| Thunderbird 115 | 115.0 | 115.3.2 | Thunderbird 115.3.2 "SuperNova" | 11 October 2023 | |
| Thunderbird 115 | 115.0 | 115.3.3 | Thunderbird 115.3.3 "SuperNova" | 18 October 2023 | |
| Thunderbird 115 | 115.0 | 115.4.0 RC3 | Thunderbird 115.4.0 "SuperNova" | 23 October 2023 | Unreleased version. |
| Thunderbird 115 | 115.0 | 115.4.1 | Thunderbird 115.4.1 "SuperNova" | 25 October 2023 | |
| Thunderbird 115 | 115.0 | 115.4.2 | Thunderbird 115.4.2 "SuperNova" | 6 November 2023 | |
| Thunderbird 115 | 115.0 | 115.4.3 | Thunderbird 115.4.3 "SuperNova" | 16 November 2023 | |
| Thunderbird 115 | 115.0 | 115.5.0 | Thunderbird 115.5.0 "SuperNova" | 21 November 2023 | |
| Thunderbird 115 | 115.0 | 115.5.1 | Thunderbird 115.5.1 "SuperNova" | 27 November 2023 | |
| Thunderbird 115 | 115.0 | 115.5.2 | Thunderbird 115.5.2 "SuperNova" | 11 December 2023 | |
| Thunderbird 115 | 115.0 | 115.6.0 | Thunderbird 115.6.0 "SuperNova" | 19 December 2023 | |
| Thunderbird 115 | 115.0 | 115.6.1 | Thunderbird 115.6.1 "SuperNova" | 8 January 2024 | |
| Thunderbird 115 | 115.0 | 115.7.0 | Thunderbird 115.7.0 "SuperNova" | 22 January 2024 | |
| Thunderbird 115 | 115.0 | 115.8.0 | Thunderbird 115.8.0 "SuperNova" | 20 February 2024 | |
| Thunderbird 115 | 115.0 | 115.8.1 | Thunderbird 115.8.1 "SuperNova" | 1 March 2024 | |
| Thunderbird 115 | 115.0 | 115.9.0 | Thunderbird 115.9.0 "SuperNova" | 19 March 2024 | |
| Thunderbird 115 | 115.0 | 115.10.0 | Thunderbird 115.10.0 "SuperNova" | 16 April 2024 | |
| Thunderbird 115 | 115.0 | 115.10.1 | Thunderbird 115.10.1 "SuperNova" | 18 April 2024 | |
| Thunderbird 115 | 115.0 | 115.10.2esr | Thunderbird 115.10.2esr "SuperNova" | 1 May 2024 | Starting with 115.10.2 Thunderbird 115 uses the ESR update channel. In the near future, non ESR releases will be published on the regular channel. |
| Thunderbird 115 | 115.0 | 115.11.0esr | Thunderbird 115.11.0esr "SuperNova" | 14 May 2024 | |
| Thunderbird 115 | 115.0 | 115.11.1esr | Thunderbird 115.11.1esr "SuperNova" | 29 May 2024 | |
| Thunderbird 115 | 115.0 | 115.11.2esr RC1 | Thunderbird 115.11.2esr "SuperNova" | 31 May 2024 | Unreleased version. |
| Thunderbird 115 | 115.0 | 115.12.0esr | Thunderbird 115.12.0esr "SuperNova" | 13 June 2024 | |
| Thunderbird 115 | 115.0 | 115.12.1esr | Thunderbird 115.12.1esr "SuperNova" | 19 June 2024 | |
| Thunderbird 115 | 115.0 | 115.12.2esr | Thunderbird 115.12.2esr "SuperNova" | 22 June 2024 | |
| Thunderbird 115 | 115.0 | 115.13.0esr | Thunderbird 115.13.0esr "SuperNova" | 10 July 2024 | |
| Thunderbird 115 | 115.0 | 115.14.0esr | Thunderbird 115.14.0esr "SuperNova" | 6 August 2024 | |
| Thunderbird 115 | 115.0 | 115.15.0esr | Thunderbird 115.15.0esr "SuperNova" | 5 September 2024 | |
| Thunderbird 115 | 115.0 | 115.16.0esr | Thunderbird 115.16.0esr "SuperNova" | 10 October 2024 | Contains security fixes from 128.3.1. |
| Thunderbird 115 | 115.0 | 115.16.1esr | Thunderbird 115.16.1esr "SuperNova" | 14 October 2024 | Contains security fixes. Final release of Thunderbird 115 "SuperNova". Upgrade is available starting with version 128.2.3. Last release to support Windows 7, Windows Server 2008 R2, Windows 8 (and 8.1), Windows Server 2012 (and R2) & macOS 10.12-10.14. |
| Thunderbird 115 | 115.0 | 115.17.0esr | Thunderbird 115.17.0esr "SuperNova" | TBA | |
| Thunderbird 115 | 115.0 | 115.18.0esr | Thunderbird 115.18.0esr "SuperNova" | TBA | |
| Thunderbird 115 | 115.0 | 115.19.0esr | Thunderbird 115.19.0esr "SuperNova" | TBA | |
| Thunderbird 115 | 115.0 | 115.20.0esr | Thunderbird 115.20.0esr "SuperNova" | TBA | |
| Thunderbird 115 | 115.0 | 115.21.0esr | Thunderbird 115.21.0esr "SuperNova" | TBA | |
| Thunderbird 128 | 116.0 | 116.0b1 | Thunderbird 116.0 Beta 1 | 5 July 2023 | Thunderbird's logo is updated starting from this release. |
| Thunderbird 128 | 116.0 | 116.0b2 | Thunderbird 116.0 Beta 2 | 10 July 2023 | |
| Thunderbird 128 | 116.0 | 116.0b3 | Thunderbird 116.0 Beta 3 | 12 July 2023 | |
| Thunderbird 128 | 116.0 | 116.0b4 | Thunderbird 116.0 Beta 4 | 17 July 2023 | |
| Thunderbird 128 | 116.0 | 116.0b5 | Thunderbird 116.0 Beta 5 | 19 July 2023 | |
| Thunderbird 128 | 116.0 | 116.0b6 | Thunderbird 116.0 Beta 6 | 24 July 2023 | |
| Thunderbird 128 | 116.0 | 116.0b7 | Thunderbird 116.0 Beta 7 | 27 July 2023 | |
| Thunderbird 128 | 117.0 | 117.0b1 | Thunderbird 117.0 Beta 1 | 2 August 2023 | |
| Thunderbird 128 | 117.0 | 117.0b2 | Thunderbird 117.0 Beta 2 | 7 August 2023 | |
| Thunderbird 128 | 117.0 | 117.0b3 | Thunderbird 117.0 Beta 3 | 9 August 2023 | |
| Thunderbird 128 | 117.0 | 117.0b4 | Thunderbird 117.0 Beta 4 | 14 August 2023 | |
| Thunderbird 128 | 117.0 | 117.0b5 RC3 | Thunderbird 117.0 Beta 5 | 20 August 2023 | Unreleased beta version. |
| Thunderbird 128 | 117.0 | 117.0b6 | Thunderbird 117.0 Beta 6 | 22 August 2023 | Beta 5 canceled. |
| Thunderbird 128 | 118.0 | 118.0b1 | Thunderbird 118.0 Beta 1 | 30 August 2023 | |
| Thunderbird 128 | 118.0 | 118.0b2 | Thunderbird 118.0 Beta 2 | 6 September 2023 | |
| Thunderbird 128 | 118.0 | 118.0b3 | Thunderbird 118.0 Beta 3 | 11 September 2023 | |
| Thunderbird 128 | 118.0 | 118.0b4 | Thunderbird 118.0 Beta 4 | 13 September 2023 | |
| Thunderbird 128 | 118.0 | 118.0b5 | Thunderbird 118.0 Beta 5 | 20 September 2023 | |
| Thunderbird 128 | 118.0 | 118.0b6 | Thunderbird 118.0 Beta 6 | 22 September 2023 | |
| Thunderbird 128 | 119.0 | 119.0b1 | Thunderbird 119.0 Beta 1 | 27 September 2023 | |
| Thunderbird 128 | 119.0 | 119.0b2 | Thunderbird 119.0 Beta 2 | 2 October 2023 | |
| Thunderbird 128 | 119.0 | 119.0b3 | Thunderbird 119.0 Beta 3 | 5 October 2023 | |
| Thunderbird 128 | 119.0 | 119.0b4 | Thunderbird 119.0 Beta 4 | 10 October 2023 | |
| Thunderbird 128 | 119.0 | 119.0b5 | Thunderbird 119.0 Beta 5 | 12 October 2023 | |
| Thunderbird 128 | 119.0 | 119.0b6 | Thunderbird 119.0 Beta 6 | 16 October 2023 | |
| Thunderbird 128 | 120.0 | 120.0b1 | Thunderbird 120.0 Beta 1 | 25 October 2023 | |
| Thunderbird 128 | 120.0 | 120.0b2 | Thunderbird 120.0 Beta 2 | 31 October 2023 | |
| Thunderbird 128 | 120.0 | 120.0b3 | Thunderbird 120.0 Beta 3 | 2 November 2023 | |
| Thunderbird 128 | 120.0 | 120.0b4 | Thunderbird 120.0 Beta 4 | 7 November 2023 | |
| Thunderbird 128 | 120.0 | 120.0b5 | Thunderbird 120.0 Beta 5 | 8 November 2023 | |
| Thunderbird 128 | 120.0 | 120.0b6 | Thunderbird 120.0 Beta 6 | 14 November 2023 | |
| Thunderbird 128 | 120.0 | 120.0b7 | Thunderbird 120.0 Beta 7 | 15 November 2023 | |
| Thunderbird 128 | 121.0 | 121.0b1 | Thunderbird 121.0 Beta 1 | 22 November 2023 | |
| Thunderbird 128 | 121.0 | 121.0b2 | Thunderbird 121.0 Beta 2 | 27 November 2023 | |
| Thunderbird 128 | 121.0 | 121.0b3 | Thunderbird 121.0 Beta 3 | 29 November 2023 | |
| Thunderbird 128 | 121.0 | 121.0b4 | Thunderbird 121.0 Beta 4 | 5 December 2023 | |
| Thunderbird 128 | 121.0 | 121.0b5 | Thunderbird 121.0 Beta 5 | 6 December 2023 | |
| Thunderbird 128 | 121.0 | 121.0b6 | Thunderbird 121.0 Beta 6 | 11 December 2023 | |
| Thunderbird 128 | 122.0 | 122.0b1 | Thunderbird 122.0 Beta 1 | 20 December 2023 | |
| Thunderbird 128 | 122.0 | 122.0b2 | Thunderbird 122.0 Beta 2 | 2 January 2024 | |
| Thunderbird 128 | 122.0 | 122.0b3 | Thunderbird 122.0 Beta 3 | 9 January 2024 | |
| Thunderbird 128 | 122.0 | 122.0b4 | Thunderbird 122.0 Beta 4 | 10 January 2024 | |
| Thunderbird 128 | 123.0 | 123.0b1 | Thunderbird 123.0 Beta 1 | 25 January 2024 | |
| Thunderbird 128 | 123.0 | 123.0b2 | Thunderbird 123.0 Beta 2 | 29 January 2024 | |
| Thunderbird 128 | 123.0 | 123.0b3 | Thunderbird 123.0 Beta 3 | 6 February 2024 |
| Thunderbird 128 | 123.0 | 123.0b4 | Thunderbird 123.0 Beta 4 | 7 February 2024 | |
| Thunderbird 128 | 123.0 | 123.0b5 | Thunderbird 123.0 Beta 5 | 12 February 2024 | |
| Thunderbird 128 | 124.0 | 124.0b1 | Thunderbird 124.0 Beta 1 | 21 February 2024 | |
| Thunderbird 128 | 124.0 | 124.0b2 | Thunderbird 124.0 Beta 2 | 27 February 2024 | |
| Thunderbird 128 | 124.0 | 124.0b3 | Thunderbird 124.0 Beta 3 | 28 February 2024 | |
| Thunderbird 128 | 124.0 | 124.0b4 | Thunderbird 124.0 Beta 4 | 4 March 2024 | |
| Thunderbird 128 | 124.0 | 124.0b5 | Thunderbird 124.0 Beta 5 | 11 March 2024 | |
| Thunderbird 128 | 124.0 | 124.0 RC1 | Thunderbird 124.0 | 13 March 2024 | Unreleased, unsupported Thunderbird Monthly release. Available on FTP server. |
| Thunderbird 128 | 125.0 | 125.0b1 | Thunderbird 125.0 Beta 1 | 19 March 2024 | |
| Thunderbird 128 | 125.0 | 125.0b2 | Thunderbird 125.0 Beta 2 | 26 March 2024 | |
| Thunderbird 128 | 125.0 | 125.0b3 | Thunderbird 125.0 Beta 3 | 1 April 2024 | |
| Thunderbird 128 | 125.0 | 125.0b4 | Thunderbird 125.0 Beta 4 | 3 April 2024 | |
| Thunderbird 128 | 125.0 | 125.0b5 | Thunderbird 125.0 Beta 5 | 8 April 2024 | |
| Thunderbird 128 | 125.0 | 125.0 | Thunderbird 125.0 | 24 April 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 128 | 126.0 | 126.0b1 | Thunderbird 126.0 Beta 1 | 17 April 2024 | |
| Thunderbird 128 | 126.0 | 126.0b2 | Thunderbird 126.0 Beta 2 | 30 April 2024 | |
| Thunderbird 128 | 126.0 | 126.0b3 | Thunderbird 126.0 Beta 3 | 6 May 2024 | |
| Thunderbird 128 | 127.0 | 127.0b1 | Thunderbird 127.0 Beta 1 | 15 May 2024 | |
| Thunderbird 128 | 127.0 | 127.0b2 | Thunderbird 127.0 Beta 2 | 20 May 2024 | |
| Thunderbird 128 | 127.0 | 127.0b3 | Thunderbird 127.0 Beta 3 | 22 May 2024 | |
| Thunderbird 128 | 127.0 | 127.0b4 | Thunderbird 127.0 Beta 4 | 30 May 2024 | |
| Thunderbird 128 | 127.0 | 127.0b5 | Thunderbird 127.0 Beta 5 | 3 June 2024 | |
| Thunderbird 128 | 127.0 | 127.0 | Thunderbird 127.0 | 11 June 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 128 | 128.0 | 128.0b1 | Thunderbird 128.0 Beta 1 | 12 June 2024 | |
| Thunderbird 128 | 128.0 | 128.0b2 | Thunderbird 128.0 Beta 2 | 18 June 2024 | Starting with this version the codename of Thunderbird 128 is "Nebula". |
| Thunderbird 128 | 128.0 | 128.0b3 | Thunderbird 128.0 Beta 3 | 20 June 2024 | |
| Thunderbird 128 | 128.0 | 128.0b4 | Thunderbird 128.0 Beta 4 | 24 June 2024 | |
| Thunderbird 128 | 128.0 | 128.0b5 | Thunderbird 128.0 Beta 5 | 27 June 2024 | |
| Thunderbird 128 | 128.0 | 128.0b6 | Thunderbird 128.0 Beta 6 | 1 July 2024 | |
| Thunderbird 128 | 128.0 | 128.0esr | Thunderbird 128.0esr "Nebula" | 11 July 2024 | |
| Thunderbird 128 | 128.0 | 128.0.1esr | Thunderbird 128.0.1esr "Nebula" | 18 July 2024 | |
| Thunderbird 128 | 128.0 | 128.1.0esr | Thunderbird 128.1.0esr "Nebula" | 6 August 2024 | |
| Thunderbird 128 | 128.0 | 128.1.1esr | Thunderbird 128.1.1esr "Nebula" | 21 August 2024 | |
| Thunderbird 128 | 128.0 | 128.2.0esr | Thunderbird 128.2.0esr "Nebula" | 4 September 2024 | |
| Thunderbird 128 | 128.0 | 128.2.1esr | Thunderbird 128.2.1esr "Nebula" | 16 September 2024 | |
| Thunderbird 128 | 128.0 | 128.2.2esr | Thunderbird 128.2.2esr "Nebula" | 18 September 2024 | |
| Thunderbird 128 | 128.0 | 128.2.3esr | Thunderbird 128.2.3esr "Nebula" | 20 September 2024 | |
| Thunderbird 128 | 128.0 | 128.3.0esr | Thunderbird 128.3.0esr "Nebula" | 1 October 2024 | |
| Thunderbird 128 | 128.0 | 128.3.1esr | Thunderbird 128.3.1esr "Nebula" | 10 October 2024 | |
| Thunderbird 128 | 128.0 | 128.4.0esr | Thunderbird 128.4.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.5.0esr | Thunderbird 128.5.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.6.0esr | Thunderbird 128.6.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.7.0esr | Thunderbird 128.7.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.8.0esr | Thunderbird 128.8.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.9.0esr | Thunderbird 128.9.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.10.0esr | Thunderbird 128.10.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.11.0esr | Thunderbird 128.11.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.12.0esr | Thunderbird 128.12.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.13.0esr | Thunderbird 128.13.0esr "Nebula" | TBA | |
| Thunderbird 128 | 128.0 | 128.14.0esr | Thunderbird 128.14.0esr "Nebula" | TBA | |
| Thunderbird 140 | 129.0 | 129.0b1 | Thunderbird 129.0 Beta 1 | 11 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0b2 | Thunderbird 129.0 Beta 2 | 15 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0b3 | Thunderbird 129.0 Beta 3 | 17 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0b4 | Thunderbird 129.0 Beta 4 | 24 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0b5 | Thunderbird 129.0 Beta 5 | 25 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0b6 | Thunderbird 129.0 Beta 6 | 29 July 2024 | |
| Thunderbird 140 | 129.0 | 129.0 | Thunderbird 129.0 | 6 August 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 140 | 130.0 | 130.0b1 | Thunderbird 130.0 Beta 1 | 9 August 2024 | |
| Thunderbird 140 | 130.0 | 130.0b2 | Thunderbird 130.0 Beta 2 | 16 August 2024 | |
| Thunderbird 140 | 130.0 | 130.0b3 | Thunderbird 130.0 Beta 3 | 26 August 2024 | |
| Thunderbird 140 | 130.0 | 130.0 | Thunderbird 130.0 | 5 September 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 140 | 131.0 | 131.0b1 | Thunderbird 131.0 Beta 1 | 5 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0b2 | Thunderbird 131.0 Beta 2 | 9 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0b3 | Thunderbird 131.0 Beta 3 | 12 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0b4 | Thunderbird 131.0 Beta 4 | 17 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0b5 | Thunderbird 131.0 Beta 5 | 18 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0b6 | Thunderbird 131.0 Beta 6 | 24 September 2024 | |
| Thunderbird 140 | 131.0 | 131.0 | Thunderbird 131.0 | 1 October 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 140 | 131.0 | 131.0.1 | Thunderbird 131.0.1 | 10 October 2024 | Unsupported monthly release. It has the same quality as Thunderbird Beta. |
| Thunderbird 140 | 132.0 | 132.0b1 | Thunderbird 132.0 Beta 1 | 2 October 2024 | |
| Thunderbird 140 | 132.0 | 132.0b2 | Thunderbird 132.0 Beta 2 | 7 October 2024 | |
| Thunderbird 140 | 132.0 | 132.0b3 | Thunderbird 132.0 Beta 3 | 10 October 2024 | |
| Thunderbird 140 | 132.0 | 132.0b4 | Thunderbird 132.0 Beta 4 | TBA | |
| Thunderbird 140 | 132.0 | 132.0b5 | Thunderbird 132.0 Beta 5 | TBA | |
| Thunderbird 140 | 132.0 | 132.0 | Thunderbird 132.0 | TBA | |
| Name | Gecko version | Version | Codename | Release date | Significant changes |