Well depending on how many users that you want to do this with; the way we do it is to create a new “contact” in the ADUC not a “user”. After you create the contact then go into the individuals that you want to forward the email to and adjust the delivery options to forward to the contact and we usually check the box to keep a mail on the server, so there is no “lost” messages. we also hide the new “contact” from the directory as this sometimes causes confusion as some internal users will send to the contact address only and circumventing your forwarding.
If you have any questions please feel free to contact me off list firstname.lastname@example.org
Hope this helps…