We have a server with SBS 2003 that carries all our users. We're looking to set up a separate server for exchange 2010. Is there a way to keep these in constant sync so that when I set up an account on SBS 2003, that it will set up the same account information for the exchange 2010 server?
Yes, Exchange requires Active Directory to work. When you setup the new server, you will add it to your domain as a member server. When you install Exchange, it will be integrated with AD. You will create mailboxes in Exchange Management Console, and associate them with AD user accounts.