XGEN: MBCLEAN Deletes Messages with Blank Received Times

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Mailbox Cleanup Agent is a server-based Exchange Utility in the "Microsoft BackOffice Resource Kit" and the "Microsoft Exchange Resource Kit" that can be used to delete older e-mail messages. It uses the MAPI property PR_MESSAGE_DELIVERY_TIME or "Received Time" to determine whether a message meets the criteria for deletion. Messages that do not contain this property or have an invalid value for this property are deleted.

Note that Microsoft Exchange Client and Microsoft Outlook assign a blank Received Time to mail messages in the Sent Items folder that are composed while you are working offline.