Hi, I've searched this problem a number of times and not come up with a solution. I've been a Thunderbird user for decades and this is a new problem to me. I have 3 email accounts in Thunderbird. One of the three is very old and has dozens of subfolders with old message storage. The other two have one or two subfolders at the most. All 3 accounts seem to have this same problem. Ninety % of the time all messages download and appear in their inboxes just fine. But sometimes I'll get downloading X-number of messages in the bottom left corner of Thunderbird but nothing shows up in any of the inboxes. I check all TRASH and JUNK folders and they are all empty (I used EMPTY TRASH ON EXIT as a setting in all accounts to empty the TRASH folder). If I go to the online servers for these three accounts no messages show up there that haven't already been downloaded to my inbox and seen by me. So it would appear there actually were no new messages to download even though Thunderbird indicated there were. A few weeks ago I searched out and found instructions for using the REPAIR FOLDER feature and ran that on the inboxes. On one account 3 old messages I don't think I'd seen did indeed appear. But use of the REPAIR FOLDER feature since then has had no effect at all. I use JUNK settings but rarely see anything show up in my JUNK boxes. Perhaps that's a clue? Can anyone enlighten me on what is happening? Thanks, BH