Thunderbird v115.9.0 (64-bit) For some time now, I have seen my iCloud email IMAP folders unsubscribed when I restart Thunderbird. At first, with an earlier, but recent, build of Thunderbird, the subscriptions would not be renewed if I did not quit Thunderbird before I restarted my Mac. Recently (like a couple of days ago), I quit Thunderbird, then restarted my Mac to update the OS to latest patch level. When I launched Tbird, I had to resuscribe to all of my iCloud IMAP folders. After that was done, I quit Tbird and then restarted it. I then had to resubscribe to my iCloud IMAP folders. I have a lot of them, so this is a time-consuming tedious process. Yesterday, I quit Thunderbird and began using Apple Male client (which I detest due to their "smartfolders"). A bit ago, I launched Thunderbird and it resubscribed to a few of my iCloud IMAP folders. I opened the Subscribe tool and rechecked a bunch of the unchecked folder boxes. It looks like it is trying to subscribe (i.e., I can see the status messages in the field at the bottom of my Tbird window that say the subscriptions are in process), but it is taking a very long time and they are not displaying in the left-hand folder pane. So, I've seen others reporting problems with IMAP and iCloud mail, but not this exact problem. Is this Apple trying to force folks to stop using IMAP? Does Tbird need to have its IMAP code updated/debugged? I really really want to keep using Tbird. What sort of diagnostics should I run?