If you are searching for the best tool to migrate from IMAP to Microsoft 365. So, I recommend trying eSoftTool IMAP Backup and Migration Software. With this tool, you can easily save IMAP Account emails to different file formats like PST, MSG, HTML, ICS, EML, EMLX, MBOX, Zimbra, vCard, and many more. Users can check the free demo version of this software by which they can import 20 emails of IMAP Accounts free of cost.