I am trying this:

sp_addlinkedserver 'ADSI', 'Active Directory Service Interfaces', 'ADSDSOObject', 'adsdatasource'

exec sp_addlinkedsrvlogin 'ADSI', false, '[local SQL LOGIN]',

'[LDAP DB USER]', '[LDAP USER PASSWORD]'

SELECT * FROM OpenQuery( ADSI, 'SELECT *...