Aren't they already moving towards this? The Thunderbird team recently announced ThunderMail which will have an optional $9/year plan.
https://www.tb.pro/en-US/thundermail/
> Thunderbird for iOS
https://blog.thunderbird.net/2025/10/state-of-the-bird-2024-...
> We’ve also seen the overwhelming demand to build a version of Thunderbird for the iOS community. Unlike the Android app, the iOS app is being built from the ground up.
Aren't they already moving towards this? The Thunderbird team recently announced ThunderMail which will have an optional $9/year plan.
https://www.tb.pro/en-US/thundermail/
> Thunderbird for iOS
https://blog.thunderbird.net/2025/10/state-of-the-bird-2024-...
> We’ve also seen the overwhelming demand to build a version of Thunderbird for the iOS community. Unlike the Android app, the iOS app is being built from the ground up.