How to clear the contents of an Office 365 mailbox

Enable “Mailbox Import Export” role

1. Connect to Office 365 Portal
2. Select Admin -> Exchange
3. Click on Permissions
4. Double-click on Organization Management
5. Under Roles, click on the plus sign (+)
6. Add the Mailbox Import/Export role
7. Ensure your account is a member of the Organization Management
8. Go to Start>PowerShell right-click on it and run as Administrator
9. Enter the following commands to connect PowerShell to Exchange Online
   1. Set-ExecutionPolicy RemoteSigned
   2. $UserCredential = Get-Credential
   3. $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
   4. Import-PSSession $Session
   5. Search-mailbox -identity USER@EXAMPLE.COM – -DeleteContent -force