Imap accounts will always check server because they can only display whatever is on server. If server has already blocked you then consider yourself fortunate because if they had deleted emails but still allowed access then you would have lost all your emails when imap acount sycnhronised with an empty server.

You need to rescue all your emails - get copies put into 'Local Folders' and then remove the old account. If only a few folders you may prefer to do it manually, but if you have quite a lot then try the addon extension - all details below. There is another option to do all manually via profile folders after exiting Thunderbird - but I'll only provide that if requested.

In 'Local Folders' account: create some new folders to receive copies of emails.

In former uni account:

• Select a small batch of emails to highlight
• Right click on highlighted emails and select 'Copy to' and choose suitably named folder in 'Local Folders' account.

Please note - I said use 'Copy to' because if something goes wrong then you will not lose emails and you can repeat. Check you have good copies by randomly selecting a few to check you can read them.

Repeat until you have good copies of all emails in 'Local Folders'.

Alternative which may be useful if you really have a lot of folders and emails. Use addon extension called 'ImportExportTools NG'

• https://addons.thunderbird.net/en-us/thunderbird/addon/importexporttools-ng/

How to install addon:

• https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

After installing: Right click on 'Local Folders' account and select:

'ImportExportTools NG' > 'Import mbox files' > 'all mbox files from directory with sbd structure'

Then you need to select the profile location, select the ImapMail folder and select the name of the former uni mail account folder and click on 'Select 'Folder'. This should then get copies of all folders including any subfolders into 'Local Folders' account,

Then you can remove the former uni account via : In 'Account Settings' Select name of uni account If using version 128* or earlier: click on 'Account Actions' and select 'Remove Account' Else you can click on red 'Delete' button located top right.

Thanks for the answer, but I'm afraid, it doesn't work.

First: All the information is locally available. I can open emails. I can search emails.

Second: The remote *account* is deleted, therefore, it doesn't connect to an empty remote; instead it seems to get a connection failure.

Whenever I happen to click on a folder, it asks me to sign in (which I can't), because it tries to sync. **The same happens whenever I try to copy an email.** This especially also happens for emails where the content is still locally available (I can open the email). I'm not sure what to do, short of "copying the content of every single email manually".

If the content really is available locally, offline, you can do File > Offline > Work Offline. When it asks to download messages, pick "Later".

If the messages are not available locally you will see "Go Online to View This Message". Otherwise, you should now be able to copy messages fro the account.

This seems to work; but: There are e-mails whose content I get shown while searching, but not when trying to open the e-mail. So the content is clearly there, but it seems to think it is not, and therefore refuses to move.

I am confused what is going on here