@erAck @thunderbird @fdroidorg so this is the story in short off the top of my head (and apart from the recent metadata mixup):
K-9 partnered up with the Thunderbird team and the app got an overhaul. So effectively, Thunderbird for Android is K-9. However, they promised us that we K-9 users would not need to switch to TB, but if we wanted to at some point, there would be an easy way.
@tinx
Right, that's what I expected, I just hope that staying on K-9 will receive (TB) updates or offer a user-friendly migration to the "real" TB.
@thunderbird @fdroidorg