Thunderbird Latest Version 151: Features, Fixed & Download
Published: May 25th, 2026 • 5 Min Read
Thunderbird latest version 151.0, has been released for Windows 10 or later, macOS 10.15 or later, and Linux GTK+ 3.14 or higher on 19 May 2026. Multiple new EWS & OAuth-related features, security & workflow enhancements, and bug, crash & vulnerability fixes have been added in the Mozilla Thunderbird monthly release.
These Thunderbird release notes provide information about all workflow changes, performance enhancements, or upgrade-related concerns if you decide to update Mozilla Thunderbird, the most widely used free & open-source worldwide.
New Features in Thunderbird Latest Version 2026
Users managing emails locally prefer to update Mozilla Thunderbird to version 151, as with these functional additions, it is a good alternative to proprietary and other paid email clients.
Thundermail OAuth Sign-in with Auto-Configuration
With the Thunderbird new release, you no longer need to manually configure the Thundermail account (email service offered by Thunderbird) using a password. Thundermail now directly opens the “Sign In with Thundermail” window in a stable way to log in more securely without failure.
Override OAuth with EWS in Thunderbird New Release
After the native Microsoft Exchange / EWS support that was deployed in v145. Thunderbird has now enabled EWS account users to specify the OAuth login settings: OAuth URL, authorization, & token endpoint, and tenant information for custom EWS accounts. Business users no longer need to switch from Thunderbird to Outlook for EWS setup.
Open PGP Security Update in Mozilla Thunderbird
Your Open-PGP public key – used for signature verification or to receive encrypted emails will no longer be shared to signed-only emails automatically.
Note: The earlier upgrade in Mozilla Thunderbird version 150.0 ensures that the Open PGP signatures from Thunderbird or other email clients have removed most visible technical formatting issues already.
Default Application Check Reintroduced in Thunderbird Latest Version
Thunderbird’s latest download (2026) have now added the option to set Thunderbird as the default email client when accessing email after it had been removed in 2022, in monthly releases.
Additional Improvement for Easier Navigation & Experience
In the Thunderbird latest release, you can now properly view the result count when searching messages via Ctrl+F and read-unread status.
Moreover, Thunderbird 151 fixes an issue where forwarding a malformed MIME email resulted in an empty body and an extra attachment and enables easy newsgroup posting cancellation.
Multiple addition bugs related to multipart/related attachments, spam filtering issues, OWL add-on description, and Thunderbird account hub hangs while checking password and proper view for virtual folders under POP3 accounts.
Unresolved Problems After Updating Thunderbird
Although Thunderbird tries to remove many fixes after a version update. Many bugs remain to persist even with the new release, such as:
- AttributeError – ReadOnlyNamespace
- Thunderbird still lags with larger profiles over 10GB
- Multiple add-on failures after a Thunderbird download version upgrade
- EWS/Exchange sync edge cases still exist
How to Update Mozilla Thunderbird to the Latest Version?
Here are the steps to download & set up the latest Mozilla Thunderbird on the computer.
New Mozilla Version Download
If you don’t have a prior Thunderbird installation. Download the latest Thunderbird version from the official website.
https://www.thunderbird.net/en-GB/download/
You can choose whether to download the ESR, Release, Beta, or Daily version.
Note: If you have the Thunderbird update setting enabled. Menu >> Settings >> Updates and enabled Automatically install updates. You don’t need to manually upgrade from an older version. It will automatically be installed upon restart.
Manual Steps to Download the Latest Thunderbird Version
- Open Thunderbird and click on Menu (three lines on top-right).
- Choose Help >> About Thunderbird.
- Click on the “Restart to Update” button.
Updating to the latest Thunderbird version is mostly advantageous. However, there are some cases where users face issues like profile corruption, duplicate email, missing email or header, keep crashing, and login issues.
To avoid data loss in such a situation, use BitRecover Thunderbird Backup Tool to save Thunderbird email in EML, HTML, PST, MBOX, and 30 other formats while preserving all the email attributes like attachments, folder hierarchy, and meta-attributes all in one go.
FAQ: Thunderbird Latest Version Updates
Q- How to check what Thunderbird version I am using?
Go to Menu (three-lines) >> Help >> Troubleshooting Information. You can view the current Thunderbird version tab.
Q- What is the latest version of Thunderbird email?
New version of Thunderbird updates are:
| Version Type | Current Version |
|---|---|
| Latest Stable | 151.0 |
| ESR | 128.9.0esr |
| Daily Release | 151.0a1 |
| Beta | 151.0b1 |
Q- Is the latest Thunderbird version stable?
Yes. Version 151.0 is stable and offers better security due to the new updates, compared to older versions.
