Hi. I've recently set up a new computer. I'm a Thunderbird user. My old computer is running Windows 10. My new one runs Windows 11. I'm running the same (current) version of TB on both computers. I can't get my emails to move from one computer to another. I know, this sounds dumb, but it isn't; my email provider uses a weird hybrid of POP3 and IMAP, and just "connecting" didn't do the trick; in fact, adding my account to TB under 11 ate most of my emails on the server because the default TB/POP3 setting kills all old emails after 14 days. Fortunately, my old emails still live on the Windows 10 computer because it DOESN'T do that. I have tried export/import, but that doesn't work because my account is very old, very large, and creates a 5GB file. I've tried just MOVING it, but TB isn't picking up the old stuff correctly. I'm pretty sure this is a TB 10/11 incompatibility for one simple reason: when I export just my address book from the 10 installation the import fails on the new (11) machine, BUT when I export it from another machine that's already running 11 I can import it on the new machine. How do I export mail from TB on 10 and import on 11 ? Thanks!