Older machines running legacy operating systems (such as Windows 7 or older versions of macOS) may require specific "Extended Support Releases" (ESR) found in the archive.
If you aren't sure which version you need, you can consult the Thunderbird Release Notes to see features and bug fixes for each specific build. Reasons to Use the Archive thunderbird download archive
Using archived software carries risks. Older versions lack the latest security patches, making your system more vulnerable to exploits. If you must use an older version, consider it a temporary measure or use it on a machine with restricted internet access. How to download older versions of Thunderbird Older machines running legacy operating systems (such as
Major updates (like the shift to "Supernova") often break older extensions. Users may download an archived version to continue using mission-critical legacy add-ons. Older versions lack the latest security patches, making
Downloading from the archive requires a few extra steps to ensure your data remains intact:
The primary repository for all past and current versions is hosted by Mozilla. You can navigate through several decades of development history: