How to Import PST to Microsoft 365 Without Outlook
Network Upload: In the Network upload method adThe Office 365 Import Service will be used by the admin to transfer PST files across the network and store them in O365.
Drive Shipping: The administrator can use the Office 365 import service to bring data from an on-site location to Office 365 by first sending the files to a short-term storage, like a BitLocker-protected hard drive, and then shipping the drive to Microsoft.
Automated Software: This technique enables the administrator to upload PST files to Office 365 with the aid of the utility in only five steps.
Read More: https://www.office365computing.com/import-export/pst.html
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Ward Tony commented
Thanks for such valuable information, I didn't know before that you can import PST to Microsoft 365, I will definitely try but I am having difficulties with Microsoft 365 activation now. Is there a site that can help with this?