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RE: Migrate from On-Premises Exchange Server to Office 365 Effortlessly
You can take the backup of Office 365 Mailbox into multiple file formats with this Cigati Office 365 Backup & Restore Tool. It can successfully backup Office 365 to PST, EML, EMLX, OST, HTML, TXT, MBOX, MSG, etc. file formats with no issue. It can offer demo version of the software to backup upto 50 emails for free.