I'm sure there are opinions about this on ILE already, but according to a search by thread title, no threads specifically about it.
Specifically, does Thunderbird manage really, really large mailboxes better than Mail? I accidentally let an archive of work emails get really big (1.1 GB) and it started crashing the app.
― truck-patch pixel farmer (my crop froze in the field) (Rock Hardy), Tuesday, 24 January 2006 14:07 (twenty years ago)