Exchange Mailbox Auditing - Trigger alert upon mailbox access

I am running Exchange 2010 SP3. I understand how to enable mailbox auditing and run reports. I am trying to figure out how to send a triggered alert to an administrator. Nothing is logged in the event viewer when Employee A accesses Employee B's mailbox, so creating a trigger based on event ID is out of the question. Likewise, the log is stored in the dumpster, so the only way to get information out of it is via the EMS.

Has anyone figured out a way to get an alert to send based on the mailbox access condition? Any help would be great.

Thanks.