Delete all mails in a mailbox by PowerShell in Exchange

One of my friends asked me. How to delete all emails in a user mailbox in Exchange 2007? 

Then I try to search the solution . I found the solution from an article "Delete emails from mailboxes - Exchange 2007" which was written by Ratish Nair.

After that, I tried to find a solution to delete all emails in a user mailbox in Exchange 2010 and 2013. I found the another solution from an article "Exchange 2010 SP1 or SP2 PowerShell cmdlet for deleting all email in a mailbox" which was written by Terence Luk. I tried to perform it in Exchange 2010 and Exchange 2013 environment.

Remark: To delete all emails in Exchange 2010 RTM , we need to add a user in "Discovery Management", "Exchange Support Diagnostics" and "Exchange Mailbox Import Export" groups and then use "Export-Mailbox -DeleteContent" to delete all emails in a user mailbox.

Reference:
Search-Mailbox

Export-Mailbox

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