Get all users Deleted Items size:

Get-MailBox | Get-MailboxStatistics | select DisplayName,TotalDeletedItemSize

Get a specific users Deleted Items Size:

Get-MailboxStatistics <alias> | select DisplayName,TotalDeletedItemSize

Purge All Users Deleted Items:
get-mailbox | Search-mailbox -SearchDumpsterOnly -DeleteContent

Purge a specific users Deleted Items:
Search-mailbox -identity <alias> -SearchDumpsterOnly -DeleteContent 
 
Check Database white space after removal:
Get-MailboxDatabase -Status | Sort-Object DatabaseSize -Descending | Format-Table Name, DatabaseSize, AvailableNewMailboxSpace

Tip! If EMS cannot find search-mailbox cmdlet type this:


Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010

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