Mozilla concludes by mentioning that they also have plans for bringing Thunderbird to the iPhone and iPad. However, Mozilla is warning potential users that the interface will likely change a few times as they continue with the development. You can already get the Thunderbird experience by downloading the K-9 Mail app now.

The team notes other features present on Thunderbird that are non-email including calendars, tasks, feeds etc, will not be in the mobile app at the start, however, they are still debating on how best to port them over.

The changes that Mozilla aims to bring to K-9 Mail in the short term include improved folder management, the same account autoconfiguration as Thunderbird on desktop, message filters, and some level of synchronization between desktop and mobile using Firefox Sync. As time passes, the developers behind the two platforms will transform the existing K-9 Mail app for Android into Thunderbird for Android as part of their vision to offer the open-source community a more powerful and privacy-respecting email experience on mobile devices.

Thunderbird mobile android