On some Computer My Thunderbird Profile is still the same as from the first version of Thunderbird from 2006. It contains a lot of strange files and is much larger than a new profile.
Please develop a full migration of the Thunderbird profile into a new profile.
Beside my I'm also Family admin of several PC with Thunderbird. Most of their Profile has the same age like my profile. It would be nice If I could migrate these profile as easy as possible. I do not wish to set up new mail clients and may forget settings or add-ons.
I suggest following behavior.