Turn off the Unified Folders view and turn it back on. If that alone doesn't fix it, right-click the Sent unified folder, select Properties, then click the Choose button. Make sure the Sent folder for all accounts are ticked, then click OK then finally click Update. This should update the Sent Unified Folder.

This does partially solve the problem. When I click the Choose button as discribed above, I see only one email option. There is no up-down-arrow to scroll to other email addresses. Only when you hover the mouse over the up-down-arrow location in te window you see the arrows and you can scroll through all the email addresses. Enable the desired email address does not solve the problem. Only when you extend the selected email address and enable all the boxes then it will work. You have to repeat this procedure the for all other boxes which are not populated like wastbin, unwanted email, etc.

You can resize that dialog to display many items.

Since 105 I have have lost all my sent emails. The size of thunderbird has dropped from 2.4 GB to 1.5GB. I have inported the Profile from a backup and the size has gone back up, but the emails still dont appear in the Sent folder. 105 is really screwed up! Sould I revert? There does not appear to be a fix yet.

PS. Just a thought. My wifes windows 11 PC seems to be working ok on 105 but my laptop on windows 10 is having the problem. Is this a windows 10 compatability issue?

fivish, Please use your own thread instead of trying to use somebody else thread for help.