When you’re going to install Exchange 2010, you’ve to prepare your environment before you can start the installation.
The fist step is to prepare the Schema.
1.) Open the root directory of the Exchange 2010 installation files
2.) Run the following command: .\Setup /PrepareSchema
Note: make sure you’ve SchemaAdmin rights
The next step is to prepare the Active Directory.
1.) Run the following command: .\Setup /PrepareAD /OrganizationName:<Your-Organization-Name>
The last step is to prepare the Domain.
1.) Run the following command: .\Setup /PrepareDomain
Note: make sure you’ve DomainAdmin rights
Your environment is now succesfully prepared to install Exchange 2010.