This is a recent change, and in fact I don't *think* there's a "missing message" problem after reading and watching for a couple of days. I *think* something has changed and Thunderbird reports having "downloaded x messages" even if it *just downloaded them a moment ago*. So it may download 5 messages, then a few seconds later you hit the Get Messages button, and there are no actual new messages but it still reports "5 messages downloaded" but nothing new is shown. As of last week, it would have reported "there are no new messages" when you hit that button soon after having received messages. So I '''think''': * there is no serious messages-missing problem * there is a disconcerting issue with a change in how Thunderbird reports status where a message arrival state is "sticky" and for some duration after getting new messages it will re-report the count of the last receipt when asked to download when there are no new messages. I could be wrong about either of these, but there's a definite change in a behavior that I'd gotten very accustomed to. It is alarming to hit the button, see a message regarding some number of new messages, and receive none. I'm guessing others, like me, spent some time panicking, searching forums, repairing the inbox... I think I'm as interested in confirming that there isn't a bigger problem as I am in getting back to the accustomed behavior. Hope this is useful; thanks for your attention! Currently on 115.11.0 (64-bit) on Windows 11; first occurred at least one version prior.