We have a current Exchange 2003 server running on server 2003, we will be transitioning over to exchange 2007 w/sp1 on server 2008. Everything is prepped but we are stuck at the exchange install saying that a reboot is required from a previous installation. The server has been rebooted, all updates have been installed and rebooted, the main 2003 DC and exchange server have been rebooted. I have seen posts pointing to a KB article for 2000 machines but it does not exist any longer. Help getting beyond this would be great.