What type of account did you delete ? If you Removed a POP account then all the pop account data would still be in the profile folders.

If you have already created a new pop account then try the following to point it to look at the original pop account.

• Right click on pop account in Folder Pane and select 'Settings'
• Select 'Server Settings'

Bottom right you will see 'Local directory:' Make the window wider so you can read all the text. It will show a text box with info that looks something like this:

• C:\Users\user account name\AppData\Roaming\Thunderbird\Profiles\abc3h802.default\Mail\mail.domain-1.com
• click on 'Browse' button

It will open a window showing contents of the current selected folder eg: mail.domain-1.com

• Go up the directory one level to see contents of the 'Mail' folder
• select the old pop account name folder which may look the same but no number eg: mail.domain.com
• click on 'Select Folder' button

Do not worry if you get wrong one as you can easily repeat these actions to reselect. Restart Thunderbird.

Thanks, I managed to solve it, rather ingeniously, I think. Main problem is, I find Win 10 very frustrating and counter-intuitive, and I have problems finding anything, files or settings, on it. Eventually I found my old folders, saved them onto a flash-drive; but then I couldn't import them into the new profile, or find where the new profile folders were stored. On my new profile, I created a dummy folder, "E-mails from Beppo," did a search to see where it was located, then copied my archived files back from the flashdrive into that location. Worked like a charm!