When installing MS Exchange 2003 on a Windows 2003 server, the deployment tools all run clean. During the MS exchange 2003 installation wizard the installation does not proceed past the entering of the password for the Exchange 5.5. service creditials. The Domain name and user name are greyed out and only the password you can enter. I enter the password for the MS 5.5 service accounts, which is DomainName\Administrator. But the error occurs: " The accountmust be valid before continuing" This is the password for the Exchange 5.5 services. Is there any way to rectify this error so I can validate and continue the install?