I recently transitioned from exchange 2003 to exchange 2010 both servers are still running side by side on the network and everything is working great. I decided to test 2010 as standalone and turned the old 2003 box off. When I do this email stops flowing to outside addresses, we can still receive from the outside . If I turned the old server back on mail flows again including what what queued up prior to the shutdown.
1) Will this correct itself when I uninstall exchange2003 from my old server?
2) What are the corrective actions (if any) ?