Determine the true size of a mailbox by adding together the TotalItemSize and TotalDeletedItemSize values.

Scenario:  Determine the true size of a mailbox by adding together the TotalItemSize and TotalDeletedItemSize values together via a script and put the values into a table.  These values are properties of the Get-MailboxStatistics commandlet.

Note:  The TotalDeletedItemSize is not included in the TotalItemSize value for a mailbox.  Test it by deleting all of your mailbox content and comparing the values before and after.  Then perform a mailbox move and Exchange will show the total size of the mailbox which is a combination of the two.

Script:

#query for your mailboxes
$stat = get-mailboxdatabase DB* | Get-mailboxstatistics | Select DisplayName,TotalDeletedItemSize, TotalItemSize,ItemCount

#Define array variable
$final = @()

#Loop
$stat | %{

$TIS = $_.TotalItemSize.Value.ToMB() | Measure-object -sum

$TDIS = $_.TotalDeletedItemSize.Value.ToMB() | Measure-object -sum

$Total = $TIS.sum + $TDIS.sum


#Build the Array
 $ServerObj = New-Object PSObject
 $ServerObj | Add-Member NoteProperty -Name "DisplayName" -Value $_.DisplayName
 $ServerObj | Add-Member NoteProperty -Name "MbxSize(InMB)" -Value $total
 $Final += $ServerObj    
}

$Final