I am building a new server that will be 2008 and it will be the pdc. My old pdc, 2003, is still in place and I don't want to promote the new one yet, can I transfer the fsmo roles to the 2008 server and still use the 2003 server as the pdc until I demote it ? Or will the 2003 pdc stop acting as primary when I transfer the roles ? I want to leave it in place for a couple more weeks. If this does work, can I demote the 2003 machine, test the 2008 box as a log in server and, if it doesn't work, can I promote the 2003 pdc again ?