Error:
The Active Directory Schema isn’t up-to-date, and this user account isn’t a member of the ‘Schema Admins’ and/or ‘Enterprise Admins’ groups.

Error:
Global updates need to be made to Active Directory, and this user account isn’t a member of the ‘Enterprise Admins’ group.

Error:
The local domain needs to be updated. You must be a member of the ‘Domain Admins’ group and ‘Organization Management’ role group, or ‘Enterprise Admins’ group to continue.

Error:
You must be a member of the ‘Organization Management’ role group or a member of the ‘Enterprise Admins’ group to continue.

Error:
You must use an account that’s a member of the Organization Management role group to install or upgrade the first Mailbox server role in the topology.

Error:
You must use an account that’s a member of the Organization Management role group to install the first Client Access server role in the topology.

Error:
You must use an account that’s a member of the Organization Management role group to install the first Client Access server role in the topology.

Error:
You must use an account that’s a member of the Organization Management role group to install or upgrade the first Mailbox server role in the topology.

Error:
You must use an account that’s a member of the Organization Management role group to install or upgrade the first Client Access server role in the topology.

Error:
You must use an account that’s a member of the Organization Management role group to install the first Mailbox server role in the topology.

Error:
Setup encountered a problem while validating the state of Active Directory: Exchange organization-level objects have not been created, and setup cannot create them because the local computer is not in the same domain and site as the schema master.  Run setup with the /prepareAD parameter on a computer in the domain {root-domain} and site (site-name}, and wait for replication to complete.  See the Exchange setup log for more information on this error.

Error:
The forest functional level of the current Active Directory forest is not Windows Server 2003 native or later. To install Exchange Server 2013, the forest functional level must be at least Windows Server 2003 native.

Error:
Either Active Directory doesn’t exist, or it can’t be contacted.