removing disconnected mailboxes in exchange 2010

I have space issue I need to remove a number of disconnected mailboxes however I'm not having any luck.  any ideas?
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this is a property of the mailbox database
Set-MailboxDatabase DbName -MailboxRetention 0.00:00:00
you need to set the deleted mailbox retention time on the database(s) to 0 days
then you need to wait for online maintenance to run to clear the space
Codedtech412Author Commented:
Maybe a silly question but how do you change mailbox retention times
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