I'm having issue with Outlook 2007, it asks for credentials when stated.
This doesn’t affect Outlook 2003 and 2010 users.
On the OWA side, when going into anything under “Options” like shown in the picture. It pops a new page and prompts for credentials. After credentials are supplied, I’m having “bad request” error. I also tried resetting IE. In this case it will not prompt me for credentials for the first time and load the page but clicking on anything within the page will pop the error: “The session has expired. Please sign in and try again”.
I’m running Exchange 2010, which was migrated from 2003 about 1 month ago.
I did reset EWS directory using EMS followed by iisreset/noforce and also tried to enable Anonymous Authentication on EWS without positive result. I have valid SAN certificate from Digicert which covers both internal and external FQDN. Auto-discover works fine. Tested using "Test E-mail AutoConfiguration" feature in Outlook.
Any advice will be greatly appreciated.