PST files stored on an external drive can be used for email migration when the files are accessible and the chosen import method supports them. Before proceeding, connect the drive, check that the files are readable, and keep a backup copy. Also, confirm that the destination Office 365 account is ready and that you have the required permissions.

For this task, the Aryson PST to Office 365 Migration Tool offers a dedicated workflow for transferring PST mailbox data to Office 365. Select the required files and review the available migration settings before starting. Confirm that your software version supports selecting PST files directly from the connected external drive.

To import PST to Office 365, choose the required source files, configure the destination account, and begin the supported transfer process. Keep the external drive connected while files are being processed. Afterward, check the destination mailbox for expected emails, attachments, and folders. Retain the original PST files until the imported data has been verified.

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