Windows XP/Outlook 2010 clients endlessly ask for authentication on Exchange 2013...

Since upgrading to Exchange 2013, I am having an issue in which when any of my Windows XP clients open Outlook, the server will prompt them for credentials and never accept them. Looking online, I see that XP/Exchange 2013 issues are fairly common. I have tried running the following:

Set-OutlookProvider EXPR -CertPrincipalName:""msstd:FQDNSERVERNAME"
Set-OutlookProvider -Identity EXCH -CertPrincipalName msstd:FQDNSERVERNAME
Set-OutlookProvider -Identity WEB -CertPrincipalName msstd:FQDNSERVERNAME
Get-OutlookAnywhere | set-Outlookanywhere -IISAuthenticationMethods Basic,NTLM,Negotiate
Get-OutlookAnywhere -Server SERVERNAME | Set-OutlookAnywhere -InternalClientAuthenticationMethod Basic (and NTLM)

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In every case, Outlook will open the very first time if I setup the account manually (not using Autodiscover). Every subsequent time, Outlook will prompt for the user's credentials but never actually accept them. Any ideas as to how I can fix this for now? While we have replaced several machines with newer Windows 7 machines, we are still not prepared to replace all of them just yet. Any ideas as to how I can fix these problems for now? Is there a way to completely remove the "CertPrincipalName" directive?

Any help would be appreciated.
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check the events on the CAS server and verify the Certificate is fine. Also you need to check the authentication is properly set or not.
Phil CoulsonCommented:
Hey there,

Here's a solution that might work:

1. In the windows profile, disable the auto discover

The register that set were (using outlook 2007):

2. Un-check option

Next step is to go Connection settings and un-check the only connect to proxy servers that have this principal in there certificate.

#Note: This process has been done using basic authentication.

Hope this works out for you. In case you have any further queries you can always reply back.

Best Regards

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medium_gradeAuthor Commented:
Phil Coulson,

The clients are using Outlook 2010. Will this still work assuming I use the correct version number?

Also, if I uncheck the "only connect to proxy servers that have this principal in there certificate" box, won't it re-populate once the user connects or is it auto discover that does that?
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