I purchased a new server and ordered it with 2003 server, come to find out an application I need to run won't run on 2003. So I call the manufacturer and they tell me that if I already have the 2000 media I can install it and use the 2003 product code to downgrade the installation. Talked to two different folks at the same company that say the same thing about this and I keep getting Product ID is not valid when installing windows 2000 server. Anyone have any ideas. I am about to purchase a WIN2K server license but thought maybe I could avoid it with the downgrade.