There were problems on the email server. As an emergency solution, a new access was created by the service provider for this email address. However, this does not contain the old emails. Unfortunately, I have already synchronized and no longer see all the old emails. However, I have now seen in the search function that I can still see the old emails in Thunderbird, but I cannot open them. You can see in the attachment that i can see emails when searching. But if i want to see one of the items ther ist the information "Keine Nachricht gefunden". How can I access these emails?