Since installation we have had a certificate prompt everytime Outlook 2007 clients have accessed our Exchange server. I have resolved this by changing the AutoDiscoverServiceInternalUri but clients now get a password prompt everytime they open Outlook.How do I fix this?

Hi,Please check which authentication methods have been enabled in IIS. Make sure that on the autodiscovery directory integrated windows authentication is enabled.Regards,Johanblog: www.johanveldhuis.nl

Hi, 1. Check authentication on each virtual directory against the settings in article below. 2. Please try to run command below: Run %systemroot%\system32\inetsrv\AppCmd.exe set config /section:system.webServer/security/authentication/windowsAuthentication /useKernelMode:false Run IISRESET /NOFORCE 3. Please check the security on \OAB folder from \Microsoft\Exchange Server\ClientAccess. Anil Default settings for Exchange-related virtual directories in Exchange Server 2007http://msexchangeteam.com/archive/2008/02/01/447989.aspx

Agreed with Anil. Any update on this yet?Arun Kumar | MCSE - 2K3 + Messaging | ITIL-F V3