Best tool to Backup IMAP Emails
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/
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Williams Welsh commented
You can try Migrate Cloud Data IMAP Backup tools: It saves IMAP files in various formats without affecting data. It migrates IMAP to various web servers, including Office 365, Gmail, Yahoo, Thunderbird, Zoho Mail, Yandex Mail, and many more cloud-based email services. You can extract the Duplicate Emails, you can Bulk Conversion of the IMAP emails at once.
Visit For More Info: https://www.migrateclouddata.com/imap-backup/