how to delete disconnected mailboxes exchange 2007

been searching threads and here in experts exchange and still cannot quite get the above done
had an engineer delete user objects in AD but did not remove the mailboxes in EMC
now we have 8 disconnected mailboxes and cannot get rid of them
I ran the following but it did not do anything but get me back to >> prompt in the exchange management shell
Get-MailboxStatistics -database "HSTC1\First Storage Group\Mailbox database"" | where {$_.disconnectdate -ne $null} | foreach {Remove-mailbox -database $_.database -storemailboxidentity $_.mailboxguid}

all help is greatly appreciated
David ElebuteSystems ConsultantAsked:
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Thomas GrassiSystems AdministratorCommented:
See the attached document

Shows how to remove disconnect mailboxes
How-to-remove-disconnected-mailboxes.doc
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