How to delete mailbox content in Office 365 or Exchange

1. Enable “Mailbox Import Export” role

  • Connect to Office365 Portal.
  • Select Admin -> Exchange.
  • Click on Permissions.
  • Double-click on Organization Management.

  • Under Roles, click on the plus sign (+).

  • Add the Mailbox Import/Export role.
  • Then ensure that your account is a member of the Organization Management.

1.2 Add permissions with Powershell

you can also use the following cmdlet to add the described above permissions:

New-ManagementRoleAssignment -Name "Import Export Enterprise Support" `
-User "[Admin Identity]" `
-Role "Mailbox Import Export"

2. Delete the content of a mailbox

This will delete all content (mails, contacts, calendars).
To verify, you can issue the command :

Get-MailboxFolderStatistics -Identity | Select FolderPath,ItemsInFolder


Search-Mailbox -Identity "John Doe" -DeleteContent