Beyond the Firefox browser to see more changes under its new CEO, the Thunderbird mail client is also expected to see some big changes in the new year.

Thunderbid today published their 2025 year in review while also offering a look ahead to 2026.

This year brought Thunderbird 140 as their newest Extended Support Release (ESR), native Microsoft Exchange email support in Thunderbird 145, continued work on their mobile story, and also the introduction of Thundermail and Thunderbird Pro.