You can try this SQL query:

select *  FROM OPENROWSET('ADSDSOObject',

 'adsdatasource;', 'SELECT  cn, mail, co, distinguishedName, displayName

 FROM ''xxxxxxxxxxxxxxxxxx'' where objectClass = ''User'' ')

Note that xxxxxxxxxxxxxxxx can be 

 GC://something.com or LDAP://something.com where something.com is an Active directory server.