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Grant full access to all mailboxes in Office 365

If you need to assign your Administrator accounts full access to all users’ mailboxes in your Office 365 environment, this guide includes a step-by-step walkthrough, including:

  • Creating a new security group for Administrators
  • Granting this new group full access permissions to all user’s mailboxes
  • Configuring it using PowerShell
  • How to remove those permissions if necessary