So I have the domain filled out and one of the main DCs set as our DNS server -- that same server is set as the LDAP server with port 389. Search user is:
cn=helpdesk,ou=IT,ou=Users,dc=ourdomain,dc=dom
Password is filled in for that user. Serach base is:
ou=Users,dc=ourdomain,dc=dom with Microsoft Active Directory selected for the LDAP schema. I downgraded to 8.0 and it may be working -- but we really need support for 8.1 and higher. Thank you for your assistance.