Download [repack] Thunderbird 31.8 May 2026

Many users report that newer versions of Thunderbird struggle to import Outlook .pst files directly. The common workaround is to install 31.8, perform the import, and then use the Thunderbird Update Guide to reach the current version.

Are you downloading version 31.8 to , or are you trying to restore compatibility with a specific legacy extension ? download thunderbird 31.8

Some older extensions developed for the XUL/XPCOM architecture (prior to the transition to WebExtensions) may only function correctly on older releases like 31.8. Many users report that newer versions of Thunderbird

Before installing an older version over a newer one, ensure you back up your profile folder located at %APPDATA%\Thunderbird\ to prevent data loss or profile corruption. It is highly recommended to use it only

While most users should use the latest stable version for security and features, version 31.8 remains relevant for specific administrative tasks:

Thunderbird 31.8 is significantly outdated and lacks modern security patches. It is highly recommended to use it only as a temporary tool for data migration.

Users on older operating systems (like Windows XP or early versions of Windows 7) may find 31.8 more stable than modern, resource-heavy builds. Important Installation Notes