I've used Thunderbird to retrieve Gmail messages for years (via pop.gmail.com), and my Inbox had thousands of messages in it. Starting yesterday, my Gmail Inbox on Thunderbird shows up as having 0 messages in it. Whereas, my Gmail Sent folder is still fine on Thunderbird, and the other e-mail account I use Thunderbird with still has its Inbox fully intact. I am using MacOS 10.13.6. I just now updated Thunderbird to version 115.16.2 but the Gmail Inbox is still empty. It can actually still receive new messages but the old ones are gone without a trace. And on the Gmail web site, all the old messages are still there (including a bunch that I had deleted on Thunderbird). Is there a specific file corresponding to Thunderbird's copy of my Gmail Inbox that I could try to restore using TimeMachine backups? Failing that, is there a way to prompt Thunderbird to download every message that is currently in my online Gmail Inbox? Thank you very much for any help you can offer.