Are you looking for a prominent solution to Migrate IMAP to Office 365, then use a reliable tool. I don't suggest manual methods because they are time taking and are not considered safe. To convert IMAP data to office 365, I prefer using a tool named
IMAP to IMAP Converter. It is a powerful tool that enables easy and safe conversion. It migrates IMAP emails with attachments to various file formats such as PST, PDF, DOCX, MBOX, etc. The utility allows users to migrate IMAP to Office 365 and IMAP,
Gmail, Yahoo, Thunderbird, Office 365, etc. It comes with an interactive interface and provides free demo version. The free trial lets you convert 50 mail items for free. To know more:
https://www.convertertools.org/imap-to-imap/
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