Here is the easiest and safest way to export IMAP account emails to a local folder in Thunderbird, which is called eSoftTools IMAP Backup & Migration software. This software is such a great option that anyone can use it, whether a beginner or a professional. With the help of this software, you can migrate and backup emails of all IMAP-based applications like Gmail, Office 365, Outlook.com, Yahoo, AOL, Zoho, etc. It always provides a free trial feature that will help you learn or use this software, so download it now.
Read more- https://www.esofttools.com/blog/export-imap-account-e-mails-to-thunderbird/
antonioksdh 