I set up rules badly for my Mail. I had several sets of rules where *any* of two rules had to be met and then the mail was put in one mailbox or another. It turns out that all my mail met a couple of the rules! So I started noticing a LOT of mail in these mailboxes. What I then did was to delete some of the rules then move the contents of the mailboxes back into the Inbox. Then I re-wrote the rules correctly so that only if *all* conditions were met would the mail go into one box or another. But I still had a couple mal-formed rules with the *any* option selected. I decided to delete ALL my rules and to move all the mail from those boxes back into the Inbox. Somewhere in the middle of doing this I noticed that recently received mail was mis-displaying. An email would have a header from one person but the body of another email! YIKES! Then search started acting up. Also while I was doing this I was hearing Mail crunching along in the background. I had a lot of mail accidentally put into those wrong mailboxes. So in the end, after those several partial changes, I patiently waited for all 25k emails to transfer back into my Inbox. Then I quit Mail and restarted it. It now SEEMS like some of the mal-formed mail is GRADUALLY getting better. Is there some kind of re-indexing I should make Mail do to really fix things? I once tried Rebuild and got into BIG trouble. (A lesson there that I vaguely recall is that you have to let it finish without interruption. I had thought that it had stalled and force-quit Mail in the middle of Rebuild.) Or will Mail gradually re-index itself and self-recover from my mangle-ations? I see official info on how to re-index, but don't want to do anything until I get my bearings here. Thanks!