Select and add your account to the eDiscovery Administrator list.

Method 1: Use the eDiscovery Export Tool (Recommended for Admins)

This is the most reliable administrative method for bulk exports or entire mailboxes without needing to configure individual Outlook profiles. Step 1: Assign Permissions

Downloading email from Office 365 to a PST file is a critical task for creating local backups, archiving departing employee data, or legal discovery. While Microsoft 365 does not natively store data in PST format, you can export it using built-in administrative tools or the Outlook desktop application.

In Purview, navigate to > Content search and select New search .

Name your search and select under locations.

To export everything, leave the "Conditions" tab blank. To filter by date or keyword, add criteria here. Review and click . Step 3: Export and Download How to export Office 365 mailboxes to PST using eDiscovery