Need to configure a group mailbox to automatically remove emails older than 30 days. Must work when not logged into mailbox.

Exchange Server 2007, Outlook clients 2003 and 2007. I have a group mailbox that people monitor (add to their Outlook Profile) but do not log into with the Outlook client. I want to set the mailbox so that all email older than 30 days get's automatically deleted. I'm not sure how to achieve this. Can't be a client side rule, and I only want this to happen on the single mailbox. Thank you.
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adamant40Author Commented:
Thanks. Probably more than I can implement but I'll talk to our Server guy and see if he will allow it.  
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