The switch to mu and mu4e is going well. I find the user interface more comfortable.
- The mail thread display is much easier to visualize and the routine email browsing key assignments are sensible.
- Search works about the same.
- Folders have one annoying bug: the automatic creation of new email folders doesn't work quite right.
- Resync for new incoming mail is manual, but it's a single keystroke, so not a real problem.
- Email composing is good, except that I've yet to set up mailing lists. The automatic find a person by typing part of their name works well.
- It's fast enough. For an email base of a little over 36K email messages the searches remain near instantaneous.