Are the client machines members of the domain? If not - then that is by design. Outlook needs to authenticate. If they are then you can tweak the authentication settings to allow the cached credentials to work. The solution should be transparent to a user on a domain member machine. Simon. -- Simon Butler MCP, MCSA, MVP:Exchange Senior Systems Administrator Amset IT Solutions Ltd. e: simon@xxxxxxxxxxxx w: www.amset-it.com w: www.amset.info -----Original Message----- From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx] Sent: 22 August 2005 16:08 To: [ExchangeList] Subject: [exchangelist] RPC over HTTP internal/external w/ISA Server 2k4 http://www.MSExchange.org/ I have ISA 2004 Server setup to allow OL2k3 users to access their emails by RPC over HTTP when they are away from the office with their notebooks. I am wondering if there is anyway to force OL2k3 to use their users local credentials to login via RPC over HTTP on the local LAN instead of prompting them for a username and password each time. It's already driving the employees mad; we had to call the men in white coats to take them away.. ;) Thanks Andrew ------------------------------------------------------ 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: exchange-list3@xxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx