Check out add2exchange
http://www.diditbetter.com/add2exchange.aspx
It's a server side application that runs and replicates the public folders you specify to your inbox in your personal folders. That will synch out to the users, and should you change something, it will then copy the changes or adds (if you set it to do so) back to the public folder once you connect and synch up.
It may do what you are looking for if you can figure out the licensing. They have a 21 day free trial available.