I am trying to install the first exchange server in the forest/domain. After installing it the first time I found that there were remnants of an old Exchange organization in active directory. I uninstalled exchange 2003 and removed all remnants (including registry) of any version of Exchange as outlined in an MS article. This process did remove the exchange attributes from the schema.
Now when I go through the steps to deploy the first server, I get an error when I try to run ForestPrep:
"The component "Microsoft Exchange Forest Preparation" cannot be assigned the action "ForestPrep" because:
-To install the first Exchange server in a domain or to run setup in "ForestPrp" mode, you must be an Exchange Full Administrator at the organization level. You must use an account that has been granted the Full Exchange Administrtor role in the Exchange organization using the Exchange Administrative Delegation wizard."
I am using the Enterprise admin account which is also schema admin, local computer admin and domain admin. I have even installed the Exchange System Management Tools and used the delegation wizard to make sure that the account has the Exchange Full Administrator role. The schema is not extended and I do need to run ForestPrep etc.
I am at a loss...help!