I kinda think maybe we should just drop application-specific importing altogether.  If Thunderbird changes its private directory layout even half as often as we do we'll never keep up with it, and they're perfectly within their rights to do so.

It would make more sense to just let the user choose a directory and have Evolution traverse it and identify files with MIME types that we think we can import [1], present the user with a list of results and let him pick and choose.

That would also be nice just for importing multiple files at once, not necessarily from another application.  For example, when downloading mailing list archives month-by-month off some place like http://mail.gnome.org/archives/evolution-list/.  Currently you'd have to either concatenate those files yourself or import them one at a time in Evolution.


[1] Or perhaps even map to, as in "this looks like the root of a Maildir directory tree, would you like this to show up as a new Evolution Mail account?" (but with better wording)

GNOME is going to shut down bugzilla.gnome.org in favor of gitlab.gnome.org. 
As part of that, we are mass-closing older open tickets in bugzilla.gnome.org
which have not seen updates for a longer time (resources are unfortunately
quite limited so not every ticket can get handled).

If you can still reproduce the situation described in this ticket in a recent
and supported software version, then please follow
  https://wiki.gnome.org/Community/GettingInTouch/BugReportingGuidelines
and create a new bug report ticket at
  https://gitlab.gnome.org/GNOME/evolution/-/issues/

Thank you for your understanding and your help.