Exchange 2003 Windows XP and Office 2007

We have an issue where a company we are supporting has there mail on a hosted mail server, this is only happening with XP Users, when they try to connect to Exchange 2013 they are continually prompted for Username and password, and it does not connect even though the credentials are right.

I know XP support has ended but I need to get this working, they have latest SP for Both XP and for office

Any help guys much appreciated
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Scott CSenior EngineerCommented:
Has this always been the case or has this worked in the past?

What happens if you use a new client?  WIn 7 and office 2013?
pepps11976Author Commented:
This has just happened since we have switched to Exchange 2013 from Exchange 2007, works fine with other office I am thinking its an XP security thing
Guillermo Rodrigo GilConsultorCommented:
You try to do the following?
The problem actually was in the SAN certificate, mainly on the Subject Alternative Names field. Put on that field as 1st line not put So Exchange was presenting itself to XP machines wrongly and it seems that XP is not willing to look at next lines on a SAN certificate. Windows 7 thou does it, therefore that problem never happened on Windows 7. So after I used that command:

Set-OutlookProvider EXPR -CertPrincipalName:""
Scott CSenior EngineerCommented:
Check your authentication methods...NTLM, etc.

I'd say it's more of an Office thing.  If you suspect XP put Office 2007 on a Win7 machine and see how it works.

Office 2007 communicates differently than later versions of Office.

When I was an engineer with Microsoft supporting Exchange we had all kinds of weird connectivity issues between Office 2007 and Exchange 2013 that simply weren't there in Office 2010/2013.

Most of it was connecting to 2013 mailboxes.

Whether it's an XP security or Office 2007 thing, there won't be any fixes for XP or 2007.  Office 2007 is also at end of life and only security fixes will be considered.  Changes to the actual product are over with.

It's time to get those clients upgraded.

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pepps11976Author Commented:
ScottCha as much as I agree with you this is not going to be an option, some companies simply will not part with money that easily :(

Guillermo Rodrigo Gil, if I was to set that command how could I roll it back if this caused further issues?
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