When I begin the installation procedure for Exchange 2003 with the setup /ForestPrep command on a new Windows Server R2 server I get a message regarding an compatibility with this version and a reference link to a Microsoft website link that does not appear to be related to the error. If I select Continue on the message box, I get the message again. I Continue once again, and the process just hangs.
This is a retail boxed version of Exchange 2003. It has never been installed, so cannot be upgraded to Exchange 2003 SP1 or SP2 (I believe).