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The easiest and most effective way to create an O365 email backup is to use Office 365 Backup Tool.
It allows you to download all your mailbox items/objects to PST, EML, HTML, EMLX, MBOX, OST, MSG, and CSV formats.
You can also migrate your mailbox data into Gmail, Thunderbird, AOL, IMAP, Hotmail, Zoho Mail, Yahoo, HostGator Email, etc as well as Backup & Restore single/multiple OST/PST files to O365
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