Bought a new (to me) computer and installed Thunderbird (38.6.0). On my "old" laptop, I used to use several folders in Gmail, and at the end of the day download all mail through POP onto the laptop's Thunderbird account. Then I would delete off Gmail. No matter what Gmail file I put it into, *all* new mail would download at the end of the day. With the new laptop, all the settings look identical, but I can't get it to download new messages some of the time, and it definitely isn't downloading messages I either read, answered or moved out of the Inbox in the gmail web app. What could be different - I'm running the two laptops next to one another with theoretically identical versions of Thunderbird and one is working to download things (read, unread, not in the Inbox, in the Inbox, etc., as long as it's "new" to thunderbird) and the other is picking and choosing everything it's downloading. And missing probably 2/3.