After installing and setting up DNS (with dynamic updates as needed), and installing Active Directory (both test fine, and I can use the machine as a DNS server). I can not install Exchange, it gives an error about not having permissions to modify the Active directory Schema, I have made the registry entry needed and I am using this machine locally as Administrator. I have been made Schema Admin by the AD install.... so I'm really at a loss as to what the problem might be. I'm sure (well hoping at least), that this is a simple problem. Anyway I have installed/reinstalled everything several times except for the OS itself (Win2k SBS). Any help would be greatly appreciated.