Mozilla Thunderbird 149 Brings Address Book Export and Multiple Bug Fixes

Mozilla has announced the release of Thunderbird 149, bringing new features and multiple fixes to its open-source desktop email client.

One of the key additions in this version is the ability to export selected contacts from the address book. This makes it much easier for users to back up their contacts or transfer them between different systems.

Another notable improvement targets Microsoft Exchange Web Services (EWS) accounts. Starred messages will now sync properly across devices, resolving previous inconsistencies when accessing the same mailbox from multiple clients.

✨ New Features and Enhancements

📒 Address Book Improvements

• Users can now export specific address book entries
• New address books are created via the Account Hub, centralizing setup and management

🛠️ Bug Fixes and Stability Improvements

✉️ Compose Window & Message Handling

• Fixed “Replace All” not updating plain text instantly
• Attachment reminder cancellations now return focus correctly to the message body
• Resolved crashes when importing certain mail threads
• Fixed an issue where encoding repair duplicated recipients and attachments

🔄 Account Sync & Email Handling

• Addressed synchronization issues affecting some EWS messages
• Fixed inability to save EWS emails to external files
• POP3 connection errors are now reported correctly
• “After Sending” filters now function as expected

🔐 Security and Encryption Fixes

• Improved reporting for revoked certificates
• Fixed issues with OpenPGP-signed messages
• Resolved problems with encrypted Gmail messages using S/MIME wrapping
• Corrected S/MIME certificate signing request generation and saving

📅 Calendar Fixes

• Publishing a calendar no longer opens an empty dialog
• Gmail calendar reminders behave correctly after dismissal
• Exporting local calendars to HTML now works properly

🎨 UI and Accessibility Improvements

• Better link visibility in dark themes
• Fixed incorrect “new messages” indicators in the folder tree
• Screen readers now properly identify previously unlabeled controls

🧹 Additional Fixes

• Prevented accidental deletion of the Trash folder without confirmation
• Eliminated duplicate unified folders during renaming

📥 Availability

Thunderbird 149 is available for download on:

• Windows 10 and newer
• macOS 10.15+
• Linux systems

Users can download it directly from the official Thunderbird website or check the announcement for full details.

💡 Why This Update Matters

This update improves usability, synchronization, and security, especially for users managing:

• Multiple email accounts
• Exchange-based mailboxes
• Encrypted communications

Overall, Thunderbird 149 delivers a smoother and more reliable email experience.

For more information, see the announcement. Thunderbird 149 is available for direct download on Windows 10 and newer, macOS 10.15 and later, and Linux systems from thunderbird.net.