Ketterer said the developer team is first working on “an amazing email experience,” and is considering the best way to provide Thunderbird’s other functionality on Android. Thunderbird for Android initially will not support calendars, tasks, feeds, or chat like the desktop app, cketti wrote in a QA included as part of his blog post. K-9 will have a similar look and feel to Thunderbird’s current desktop app, with the exception of certain functions. The feature is expected to be implemented in the summer of 2023. Mozilla plans to offer Firefox Sync as one option to allow users to securely sync accounts between Thunderbird and K-9. 'In other words, K-9 Mail will soar to greater heights with the help of Thunderbird.” “Joining the Thunderbird family allows K-9 to become more sustainable and gives us the resources to implement long-requested features and fixes that our users want,' Sipes said.

Ryan Lee Sipes, Thunderbird Product Manager, said working with the Thunderbird email team to develop the new mobile client made more sense than developing a mobile client from scratch. Like Thunderbird, the K-9 Mail project is entirely funded by the Mozilla Foundation community of open source developers.Ĭurrently, Android mobile users have a number of email and chat options, including Google’s Gmail, Microsoft Outlook and ProtonMail, an end-to-end encrypted email service. Thunderbird is a free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. Ketterer is better known in the Mozilla open-source developer community as cketti. “Ultimately, K-9 Mail will transform into Thunderbird on Android, once certain development milestones have been achieved which align it closely with Thunderbird's feature set and visual appearance,” K-9 Mail Project Maintainer Christian Ketterer said in a blog post.

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