A. Yes. With SMS and SCCM, the parent site must always be the same or higher version of its children. This means if you have a mix of SMS 2003 and SCCM 2007 sites, then the SMS 2003 sites would have to be children of SCCM 2007 sites. You can't have a SCCM 2007 site as a child of a SMS 2003 site