I keep re-trying Thunderbird, hoping it has improved, but keep abandoning it because it keeps annoying me. Especially that embarrassing contacts importer.

But it's still the best I've found on Windows, so I keep installing it everywhere, and helping others do so as well, especially at school (as the school's setup info is about 3 versions of their email server behind).

Isn't obvious way to fix outdated setup guide is to write-edit new? (if it will cost less time to you rather than teach everyone in person)

They won't let me. Despite working for over a year in what's essentially their employee-tech-support / teach-me-how department. But yes.

Care to explain?

I have been using Thunderbird for 3-4 years at this point. I have indexing on and that sort of stuff. But searches that include the body text is remarkably slow. It does not seem to search inside attachments as well.

It would be awesome if I could fix these.