The most reliable way to find older versions is through the Official Mozilla Release Archive , which hosts every version from the original 0.1 release to recent ESR (Extended Support Release) builds. Official Download Sources
While newer is usually better, sometimes you need a specific version of Mozilla Thunderbird to maintain compatibility with an essential legacy add-on or to restore a familiar interface like the "Classic View". thunderbird earlier versions download
This is the primary repository for all historical releases. The most reliable way to find older versions
To ensure your download is safe and untampered, stick to these official paths: stick to these official paths: