How to stop Outlook 2007 from Prompting for Credentials

   We migrated from Exchange 2003 that was on a Server 2003 to Exchange 2007 on Server 2008. I don't know if this is a factor, but the Server 2008 that Exchange 2007 is on is a Virtual Machine running on XenServer 5. The old exchange server is a physical box. The Exchange 2003 has been removed from our domain  . All of our workstations are XP Pro SP3.
 
    The issue we have is all Outlook 2007 clients keep asking for credentials.  And only the Outlook 2007. All of the user's (about 40 of them) that still have Outlook 2003 work just fine. We have only  5 user's that use Outlook 2007.  We have changed the outlook confiuration in every combination. We have tried changing our passwords, recreating the outlook profile (with autodiscover and manually), removed the PC from the domain and readded, and every other suggestion I could find through Google. There are no event logs, error, or information that would give a clue as to what is causing this.
 
      We have been working on this for weeks. We have an open ticket with Microsoft for close to a week and have heard nothing back.

   
jison79Asked:
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NpatangCommented:
make sure that EWS, OAB should be on Interated AUthentication in IIS and Autodiscover should be on Basic and Integrated Auth.

Also disable the kernal mode Authentication.
http://technet.microsoft.com/en-us/library/aa998237.aspx
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rizwanidreesCommented:
User can access their mails after providing credentials or not?.

If not than check if that PC can access the mail server using telnet
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
If you open Outlook and select Tools -->  Account Settings -->  Change (for Exchange)  -->  More Settings... -->  Security Tab  = under User Identification is Always prompt for logon credentials checked?
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jison79Author Commented:
Users are able to send and receive email between password promts. The always promt for password is not checked.  I have checked the authentication settings for EWS and OWA and both just have Windows Authentication enable and nothing else. Autodiscover has both Windows and Basic Authentication enabled.
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NpatangCommented:
What is the Authentication on the OAB Vdir and isable the kernal mode AUthetication as mentioned above
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SaakarSenior Technical ConsultantCommented:
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jison79Author Commented:
Windows Authentication for OAB. I'll let you know what happens after i disable Kernal Mode
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jison79Author Commented:
Do to compnay politics i will not be able to work on this issue. I will go ahead and close this question and reward points.
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