Installing the First Exchange Server 2003 System in an Exchange 5.5 Site
Because there are many prerequisite tasks and processes to run, getting to the point of the actual Exchange Server setup is a watershed event. The following section double-checks that the prerequisites have been fulfilled. When installing the first Exchange Server 2003 system, it is recommended that you use a server that has been wiped clean and has a fresh installation of Windows Server 2003. This is because the first server in Exchange holds many critical Exchange organizational management and routing master tables, and having a new, clean server ensures that the masters are created and stored on a solidly configured system.