Office 365 Exchange import pst

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Is it possible to import to one account data from a pst file from a different acount?

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To import (or export) content from a mailbox you need to have Import/Export admin role (see You can assign the role using the Exchange Online ECP while logon with an admin account or with PowerShell Then to import the content from a mailbox, you need to logon with PowerShell (see and use the New-MailboxImportRequest (see°

Yes. When you create the mapping file, you can map any PST file to any mailbox.