We have a development Active Directory domain with a single Last Exchange server Std version 2003. We needed to install Exchange Server Enterprise version 2003 instead. We didn't care about any emails or configuration on existing exchange server and wanted to run a clean installation of a new exchange server. We have uninstalled the exchange server via Control Panel Add/Remove Programs. Now when we go to install new Exchange Enterprise server it gives a message that we need to forest prep or do not have exchange permissions. We also get the same message when we try to run forestprep (even though account is member of schema/enterprise admins). I think we need to run exchange setup /removeorg to clean out AD and then rerun forestprep and domainprep. Any advice?