Hi,is there any body able to guide - difference between windows vista and longhorn server. - PKI enhauncements in windows vista. - I heard Microsoft provided built-in OCSP responder / Server inwindows Vista, is it correct? If yes which windows Vista version contains OCSP server (in windows Vista ultimate or windows Vistabusiness ...)? - How to configure/manage OCSP responder (OCSP Server) in windowsVista? - is there any OCSP client available in windows Vista? if yes howto configure OCSP client in windows Vista. - Smart card logon support and Kerbrose in windows Vista.help appriciated.Thanks,Best RegardsAtiq Ur Rahman Chaudhary