ByThunderbird 147 Official Update – What’s New?
The release of Mozilla Thunderbird 147 is a significant milestone for us. This update not only makes the email client more stable and reliable than ever before, but it also includes improvements that directly impact the productivity of both power users and professionals. Thunderbird 147 includes two useful new features and several critical bug fixes, making it more mature than ever.
Thunderbird has long been known as a free and open-source personal information manager, and this update continues that tradition — offering better control, greater stability, and a user-centric experience.
New Feature: “Show Full Path” Option for Compact View
For users who utilize the Compact View, Thunderbird 147 brings a major improvement. The “Show Full Path” option is now available in the folder pane.
Key Benefits of this Feature:
Clear identification of deeply nested folders
Eliminates confusion between folders with similar names
Improved folder management in professional email accounts
This feature is especially useful for users who work with corporate email, multi-account setups, or archive-heavy mailboxes.
Major Change in Localized Special Folders
Mozilla has made a significant technical change regarding Special Folders Localization in Thunderbird 147. The translation of special folders (such as Inbox, Sent, Trash) is now limited to predefined names only.
New Preference: mail.useLocalizedFolderNames
With this change, a new setting has also been added:
mail.useLocalizedFolderNames
This allows you to control whether:
Localized folder names are used or not
Folder names change or remain static when the system language is changed
This control is extremely useful for users who prioritize technical stability and cross-device consistency. Thunderbird 147: Major Bug Fixes
Multiple Folder Compaction Issue Resolved
Previously, compacting multiple folders simultaneously would sometimes fail. This issue has been completely resolved in Thunderbird 147, making disk space management more reliable.
Incorrect Unified Archive Subfolder Information Fixed
Now:
Incorrect subfolder names are no longer displayed
The empty message list issue is resolved
This improvement is particularly important for users who regularly use the Unified Inbox and Archive system.
OpenPGP .eml Attachment Bug Fixed
A critical bug reported in Thunderbird 128, where the “Open and Show” button for OpenPGP-signed .eml files did not work, has now been completely fixed in Thunderbird 147.
This fix is crucial for users who rely on end-to-end encryption.
List of Other Important Bug Fixes
Thunderbird 147 includes several smaller but impactful improvements:
Selected status and priority were not displayed correctly in Search Widgets — now fixed
Japanese locale users can now create message filters without issues
The “Attachment” search in Settings now correctly searches the “Files and Attachments” section
Account Hub now displays a clear error when creating OAuth2 EWS accounts fails
The hang issue when sending multiple emails via SMTP is resolved
Calendar now provides timely alerts for connection problems
It is now possible to create Tasks with a Start Date or Due Date
All these improvements further strengthen Thunderbird as a professional-grade email client.
Thunderbird Pro: A Direct Challenge to Google and Microsoft
Mozilla doesn’t want to be limited to just an email client. With Thunderbird 147, the company has also given a glimpse of its larger vision — Thunderbird Pro.
This is an ecosystem of services that will directly challenge Google Workspace and Microsoft 365.
Thundermail: A New Secure Email Service
The most important part of Thunderbird Pro is Thundermail — a new email service. Key Features
Your custom email address, such as @thundermail.com
Privacy-focused architecture
Secure email with the trust of Mozilla
This service is being designed for users who value data privacy, open-source principles, and long-term reliability.
Appointment: Smart Meeting Scheduling Tool
Thunderbird Pro will include Appointment, which:
Allows people to book meetings directly on your calendar
Reduces unnecessary email exchanges
Makes professional scheduling easy
This feature will be incredibly useful for freelancers, consultants, and business users.
Thunderbird Send: End-to-End Encrypted File Sharing
Thunderbird Send will be a secure file-sharing service with:
End-to-end encryption
A privacy-first approach
Easy and fast file transfers
This service will be a robust option for those who need to share sensitive data.
Why Thunderbird 147 is a Significant Update
We believe that Thunderbird 147 is more than just a minor update. It:
Increases user control
Improves stability
Prioritizes security and privacy
And lays the foundation for the future Thunderbird Pro ecosystem
For users who want a reliable, open-source, and professional email solution, Thunderbird 147 emerges as the ideal choice.
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Thunderbird 147 – Frequently Asked Questions (FAQ)
Question 1: What is Thunderbird 147?
Answer: Thunderbird 147 is the latest email client update released by Mozilla, featuring two new useful features, several important bug fixes, and improved stability. It is the newest version of the free and open-source personal information manager.
Question 2: What new features have been added to Thunderbird 147?
Answer: Thunderbird 147 primarily includes two new features:
The “Show Full Path” option in Compact View
A new setting to control Special Folders Localization: mail.useLocalizedFolderNames
Question 3: What is the “Show Full Path” feature useful for?
Answer: This feature is very useful for users who use Compact View and have many nested folders. It displays the full location of the folder, eliminating confusion.
Question 4: What does mail.useLocalizedFolderNames do?
Answer: This new preference allows us to decide whether Special Folders (such as Inbox, Sent, Trash) in Thunderbird are displayed in the local language or with the default English names.
Question 5: What bug fixes are included in Thunderbird 147?
Answer: Thunderbird 147 includes several important bug fixes, including:
Resolution of the issue with compacting multiple folders
Fixed incorrect names and empty lists for Unified Archive Subfolders
The “Open and Show” button for OpenPGP-signed .eml files now works correctly
Resolution of the SMTP sending hang issue
Calendar connection error alerts are now displayed correctly
Question 6: Does Thunderbird 147 also include security improvements?
Answer: Yes, with the OpenPGP-related bug fixes and SMTP improvements, Thunderbird 147 is more secure and reliable than before.
Question 7: What issue has been resolved for Japanese locale users?
Answer: In Thunderbird 147, Japanese locale users can now create Message Filters without any issues, which was not possible before.
Question 8: What is Thunderbird Pro?
Answer: Thunderbird Pro is a suite of new services being developed by Mozilla, aiming to challenge large ecosystems like Google and Microsoft.
Question 9: What is Thundermail?
Answer: Thundermail is a new email service from Thunderbird Pro, providing users with secure and privacy-focused email addresses like @thundermail.com.
Question 10: What is Thunderbird Appointment used for?
Answer: Thunderbird Appointment is a meeting scheduling tool that allows people to book appointments directly on your calendar.
Question 11: What features will Thunderbird Send offer?
Answer: Thunderbird Send will be an end-to-end encrypted file sharing service, allowing for secure file transfers.
Question 12: Who is Thunderbird 147 best suited for?
Answer: Thunderbird 147 is best suited for users who:
Prioritize privacy
Prefer free and open-source software
Want professional email management
Question 13: Is Thunderbird 147 free?
Answer: Yes, Thunderbird 147 is completely free and open source.
Question 14: Is Thunderbird 147 better than previous versions?
Answer: Absolutely. With improved folder control, significant bug fixes, and compatibility with the upcoming Thunderbird Pro ecosystem, Thunderbird 147 is a clearly superior and more stable version.
Question 15: Why should I update to Thunderbird 147?
Answer: Updating to Thunderbird 147 is highly beneficial for improved performance, fewer bugs, enhanced security, and compatibility with future Thunderbird Pro services.
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