Verifying Administrator Access to Office 365 User Content

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Office 365 Administrators have many ways to access user data. It’s important to set up a policy to control and then verify that access. If you don’t, your administrators might be looking into Exchange mailboxes, SharePoint, and OneDrive without oversight. And that would be a bad thing.
https://www.petri.com/office-365-user-content-admin-access