Exchange to Exchange SBS conversion

We currently run a full version of exchange 2003. I want to convert our company over to Microsoft Small Business Server 2003 due to the many features and benefits we will gain. We are a company of 20 employees.

Is there a recommended method for moving all of the pub, priv, and dir information from the standard version of exchange to the sbs version? Can I do a standard restore or is there differences in the way the databases are structred between the two different versions?