I move old emails to archive folders, by year, when I get around to it. Today decided to shift emails from Sent file back to 2020, and from Inbox for all of 2022 and for the first half of 2023. Archived each year's batch separately. In every case I got a "Thunderbird not responding", so eventually stopped it via Task Manager. When I restarted, all the highlighted emails had been moved properly. When I did it for the first half of 2023, all the emails appeared as expected in the 2023 Archive folder ... for a few seconds. Then they all disappeared, as did much of the content of the other annual archive folders. What do I do to recover all those emails?