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State of the Thunder 14: The 2026 Mobile Roadmap
Quoting: State of the Thunder 14: The 2026 Mobile Roadmap - The Thunderbird Blog —
Next year’s top priority is rearchitecture and core maintenance. The underlying code behind the Thunderbird for Android app, which was built on top of K-9 Mail, is 15 years old. That’s ancient in software terms. This work will make the app more stable and reduce the odds of developers breaking the app through their changes. This is a broad initiative with lots of elements. This includes bringing consistency across apps, including UI. For several reasons, we won’t be continuing with Material UI. Instead, we’ll be using our own homegrown Bolt UI.
Another feature the mobile team would like to prioritize is continuity with Thunderbird Pro. Since the exact delivery dates for these services have not yet been defined, setting priorities is difficult, but the team has confirmed the Thundermail integration will come first. Integrating Send, our end-to-end encryption file share, will be trickier when it comes to mobile. However, this may ultimately enable encrypted sync for user account settings as a future feature.
The team also plans to modernize the Message List and Message View, in addition to ensuring they work well. As users probably spend most of their time on these screens, this is key to get right. We want to have an experience that compares to other mobile mail apps in a good way.