Exchange /Outlook: how to notify mailbox X about new mail in mailbox Y?

We have Exchange 2007 with Outlook clients. We have Outlook clients in production cells, where all cell members have access to the computer, logged on with cell-assigned username. Cell leaders also have their own mailboxes, where they may receive confidential emails from HR, management etc. - but the problem is that cell leader is not constantly logged on, he will go to separate room to work with his email.

Is there a way to send notification to the cell workstation whenever cell leader's mailbox has received new email?