Hello there Donald schleich. We have read your message. We try to help you.

https://support.mozilla.org/en-US/kb/manual-account-configuration

Can you check if you have got a double account with Thunderbird? A imap account and pop account with the same initials?

Right click the account name in the folder pane and select settings.. Determine which on of the accounts you do not want and use the account actions button to remove it.

Did you had any crashes around the same time with Thunderbird? Maybe it’s possible to delete the msf file on your system. To reset the (inbox.msf) msf file. Please make a backup before doing this from the emails inbox./ profile.

First backup your profile http://kb.mozillazine.org/Profile_backup but do not compact folders as recommended in that link.

Close Thunderbird and navigate to your Profile Folder.

(http://kb.mozillazine.org/Profile_Folder ).

Find and delete the files with the extension msf. Restart Thunderbird. Thunderbird will recreate the .msf files as you access each folder.

See if this problem did go away? Contact us after trying.

Greetings Firefox volunteer.

Hello, Thank you for trying to give me some help, but I am not a specialist... It seems that I simply have an imap account.My problem appeared all of a sudden without my doing any changes on my account.Most probably it followed a program update... I do not know what the msf file is ...

Hello there Donald Schleich.

Oké try to go to the msf.file. Inbox.msf

What kind of computer do you have? What sort of window operating system do you have?

Can you operate a computer?

Greetings Firefox volunteer.

Hello there again.

If you know how to operate a computer. Please read this. https://datahelpsoftware.com/blog/thunderbird-inbox-email-missing-and-deleted-messages-reappear.html

It could that you having the same folder in pop format and in Imap format on the same computer.

Hello, My computer is a Mac. OS Catalina. To your question : "can you operate a computer" my answer is "NO" unfortunately.... I read the page you indicated and tried the first approach to repair folders, with no success.

As I said previously, I see a problem but I am not able to modify it. The location for the first folder I have for Draft is : imap://donald.....INBOX/Drafts The location for the second folder I have for Draft is : imap://donald....INBOX/DRAFT The locations are almost identical except for the spelling of the word draft. The folder that is active is the first one : when I want to register an email, it goes in the folder: imap://donald.....INBOX/Drafts and not in the other one, although I cannot delete the second one...

And I have a similar problem with the folder "Sent" Thank you for your time

Hello there again.

what message exactly you’ve get when you try to remove it?pop- up? You know how to find this maps, oke where are they located? Go to the place where they suppose to be? And are they there at there place? Can you delete them?

Or try to find out if there is similarities of software are on your machine. Thunderbird.exe files. They supposed to be in the map for profiles and accounts. Can you try to find a another map with one of these names spelled the same? I will try to find some information in Thunderbird for you.

Greetings Firefox volunteer.

Hello there again Donald.

I try to help you how to come to account settings and there you can delete the other account if it s present over there.

Click the Thunderbird Menu icon (three horizontal bars) at the upper-right of the Thunderbird pane. Hover your cursor over Options and click Account Settings. Select the account you wish to delete and click Account Actions. Click Remove Account.

If there are two different or similar accounts profiles delete the one you want to delete,oke. But do not delete them all.

https://support.mozilla.org/en-US/kb/manual-account-configuration

Remove an Account Here's how to remove an email account from Thunderbird.

Go to the account Manual Set Up screen. Select the account that you want to remove. Click Account Actions and select Remove Account from the list. Thunderbird confirms that you want to remove the account. Click the OK button to continue removing the account.

trying to remove the maps where ain good. Try to remove the unwanted maps by reading how to.

I found some extension also a remover. https://addons.thunderbird.net/nl/thunderbird/addon/removedupes/?src=search

You can try to use and use the delete option in the program if possible. https://addons.thunderbird.net/en-US/thunderbird/addon/localfolder/

Then contact me again.

Greetings Firefox volunteer.