troubleshooting Question

Autodiscover service making life with Outlook 2007/2010 hell

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BarthaxFlag for United Kingdom of Great Britain and Northern Ireland asked on
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We have a customer that has migrated their SBS 2003 Exchange install to Exchange 2010 on a new Windows 2008 R2 server.  All Outlook 2003 clients and iPhone/iPad clients are working fine with the migration.

Outlook 2007 and Outlook 2010 clients, however, continuously nag the user for credentials to log into  These clients perform all the normal activities - sending, receiving, etc.  When not using cached mode, a manual Send/Receive will collect the new e-mail and then pause at about 98% of the receive connection.  After about a minute the client will then ask the user for credentials to log into - something the customer has never been a part of nor do they have an account.

After some research, I can confirm that the Exchange 2010 installation:

- Has "Get-ClientAccessServer | fl AutoDiscoverServiceInternalUri" set to their internal server's "https://<server>/Autodiscover/Autodiscover.xml" URL.
- Has "Get-AutoDiscoverVirtualDirectory | fl InternalUrl, ExternalUrl" both set to their internal server's "https://<server>/Autodiscover/Autodiscover.xml" URL (they have no external Outlook clients).

I have discovered Microsoft Knowledge Base Article 2480582 and have altered the registry on these workstations to include the internal server's address (removing the entry there).  This made no changes.

This is a small company with one Exchange server, no requirement for external Outlook clients and no affiliation/requirement for  How can the installation be configured to prevent this CONSTANT nagging for credentials?

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