How do I setup inter-branch dialup connectivity that periodically dials between servers to synchronise Active Directory and Exchange mail

I have a client who runs AD on Win2003 with Exchange. They now require a branch office setup that does not have access to permanent internet connectivity. The best they can get is ISDN dialup. Now there is a domain controller who is a member server of the AD forest at HO and Exchange is to be setup at the branch office as well. What is the best way to setup a dialup routine that will periodically (eg every 2 hours) dialup to the HO network and synchronise AD. In addition, I would like Exchange to route the mail for the users that are on the other exchange server down to the branch exchange server when the connection is up. I need help on this real fast. Please ... if you can give me any advice!?
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