Forwarding E-mail on Exchange 5.5

I am using Exchange Server 5.5, fairly new to using it and a little stuck. I have done a little looking around in the help provided in Exchange and have not seen anything that applied to my question. So here it is.

In my office I have a person who is gone all the time. I have an mailbox setup for them in recipents and the mail to them just sits there for weeks until they come back in to the office and logs on to the office network with their laptop. They have an AOL account setup for theease of access across the country. What do I have to do in Exchange Server so any e-mail received at the office address, for this person, is forwarded out the their AOL address?

Thanks a ton for your help.
Dean