Started using TB in 2005 on a mac laptop with ISP POP server with multiple accounts. Over years used on concurrent multiple devices and pc/mac os'es. After 3-4 years switched to IMAP. Knew just enough to restore devices, copy/move profiles and install/setup TB and ISP accounts. Yes just enough to get me somewhat messy. But with a little Mozillazine help get by. I try to run the same TB, 60.5.0, and basic setup on let's say a MoJave Mac and 2 Windows 10 pc's. To simplfy say : mac [email protected] [email protected] [email protected] email2 "" email2 "" email2 " [email protected] [email protected] [email protected] spread over let's say 3 domains and a dozen distinct e-mail accounts. All setup to NEVER delete messages automatically. It worked until last year when some accounts wouldn't receive new e-mails when I then started deleting messages more judicously. That worked for awhile then I also started archiving many on my main computer the mac. Now on some accounts I seem to be missing some more recent periods of time and now notice that many of the Archived message years seem to be back in their inboxes or missing. Yes, I have a mess and am looking for advice to straighten this out for good. I need most of the accounts (address...@domain..) so that part I have some flexibility, but not a lot. Any questions on my mess and philosophies/tips/options to use to improve organization, usage and most importantly keep most of my e-mails available for search and reference would be greatly appreciated. Thanks