Message age limit properties that are used by Mailbox Manager in Exchange Server 2003 and in Exchange 2000 Server

http://support.microsoft.com/kb/302804

How dates are computed in Exchange 2003 and in Exchange 2000
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Mailbox Manager examines the following MAPI properties to determine whether to process a message. If any messages are more recent than the age limit that is imposed by the Mailbox Manager recipient policy, the message is not processed: Note Mailbox Manager examines the properties by using the "AND" operator. Therefore, all properties must meet the criteria.

• PR_MESSAGE_DELIVERY_TIME
• PR_CLIENT_SUBMIT_TIME
• PR_LAST_MODIFICATION_TIME