Better handling of .ics files, allowing you to preview and import events by double-clicking. System Requirements for 91.11.0

It is one of the final versions to officially support Windows 7 and 8.1 with high stability.

Whether you need it for legacy system compatibility or specific add-on support, here is everything you need to know about downloading and installing this specific release. Where to Download Thunderbird 91.11.0

Some legacy extensions that broke in the "Supernova" or "Nebula" updates still function perfectly here.

Before downloading, ensure your hardware meets these baseline specs: Release Notes (91.11.0) - Thunderbird

Version 91 introduced native support for Apple Silicon (M1/M2) CPUs , making it a performant choice for older Mac workflows. Key Features of the Thunderbird 91 Branch