I need to forward all emails arriving in 1 Exchange box to two other boxes. All I've been able to find is the option to forward it to 1 box. Example: a@mydomain.com forwards to b@mydomain.com and c@mydomain.com Anybody know how to do this?

If this is a service e-mail address, you could just make it a group instead of an account. If it needs to stay an account, just forward to a group that contains the people you want to receive it.