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Import OST files to Office 365 account: Use the Import OST files feature provided by Microsoft via the Office 365 Admin Center or through PowerShell. You can import OST files directly into Office 365 mailboxes using the Network Upload Method or via the Drive Shipping Method (by physically shipping the data to Microsoft).
https://www.vartikasoftware.com/product/vs-ost-to-office365-converter.html
