Hi- this is an "anticipatory" issue, that is, nothing will happen yet, but will happen "soon." 1) since all the mail accts are IMAP, do I need to "back up" anything, and then "move" anything to a new computer, re emails themselves? 2) If I would need to move any emails from that old computer to the new computer? We're NOT talking abt email acct settings, which I will manually put into the new computer. -description: the old email app that currently is operational & exists on "old" computer (again, there is NO "new" computer right now), is mailbird, a paid email prog. with which name/app you may know about. -"Old" computer is w10pro. "New" computer will be w11pro. "New" : Alder lake, 16 or 32 MB real RAM, big SSD. so no issues foreseen. 3) what I really want to do for "new" computer: I want to '''install t-bird stable''' w/IMAP, & have all msgs as were present on "old" computer, present & workable on "new" computer. 4) history: for last 4y or so, t-bird failed in several ways on "old" computer, made it a PIA for client to use. I was unable to successfully overcome the t-bird problems. So I moved the client's email setup to Mailbird, $60 or so paid. Mailbird has its own problem set, so on "new" computer, I want to initially try out t-bird first to see if it will work "right" for client, right out of the box. Client used t-bird for many yrs, & I have continually used t-bird since its inception, w/o issues. I prefer it for many reasons. 5) I esp. want to know abt w11 probs w/t-bird, current. Thank you, stay safe.