If you want a reliable and advanced software tool for moving IMAP emails to Office 365, different email clients, or file formats, I would suggest the CloudXena IMAP Email Backup Tool. This software helps you safely move mailboxes between email servers that support IMAP without losing any data. It works with all major email services like Gmail, Yahoo, Office 365, and others. Using this software, you can migrate one or an entire mailbox at once.

To know more: https://www.cloudxena.com/imap-backup-tool/