You want to use the Exchange Server 2003 Deployment Tools (ExDeploy ) to help ensure that your existing Active Directory and DNS infrastructure is properly configured and ready for your Exchange Server 2003 deployment.
Double-click the Exchange Setup utility (setup.exe) on the product CD.
Click Exchange Deployment Tools.
Select what tools you want to run by clicking on the appropriate link:
Click on Deploy the first Exchange Server 2003 server if you're preparing to install the first Exchange Server 2003 server in an existing 5.5 organization.
Click on Install Exchange Server 2003 on additional servers if you're upgrading Exchange 2000 servers or installing additional Exchange Server 2003 servers into an existing Exchange 5.5 or Exchange 2000 organization.
Click on Perform post-installation steps to see a list of checklists for useful post-installation actions you can take (including moving mailboxes and public folders, running the Internet Mail Wizard, and setting up spam filtering).
Click on Install Exchange System Management Tools Only if all you want to do is install ESM on a workstation or server. The resulting checklist will tell you exactly what prerequisite services are required to get ESM running on Windows XP (SP1 and SP2), Windows Server 2003, and various versions of Windows 2000.
Click on Consolidate Sites in Exchange Mixed Mode if you want to consolidate ...