>I don't want to start flame war, just curious. >What is the best and widely used (de facto standart) directory service in >enterprise level? Beats me, but I'd guess NDS for seats supported. With ADS coming on strong. Sun sells iPlanet, but I've never met it, and IBM sells SecureWay which doesn't seem to be anywhere. It would probably be impossible to measure seats supported by OpenLDAP in any accurate way.