They are both different protocols all together type the following into google and see for yourself: define:http define:rpc But if i read the question right, you want to know how they come together..RPC traffic is tunnelled over HTTP traffic in order to allow RPC programs like outlook to connect to an exchange server, sitting behind a firewall. Why you may ask, because generally opening RPC endpoints on your firewall is a bad idea. Greg Mulholland ATM is for banks! ________________________________ From: Biswajit Sahu [mailto:biswajit2000@xxxxxxxxx] Sent: Tuesday, January 24, 2006 3:56 PM To: [ExchangeList] Subject: [exchangelist] HTTP&RPC http://www.MSExchange.org/ Hi all, Anybody can explain me what is diff between HTTP and RPC Thanks ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: greg@xxxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to info@xxxxxxxxxxxxxx