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Event ID 1 is logged on the Exchange Server 2010 Client Access server in a mixed Exchange Server 2010 and Exchange Server 2003 environment
Article ID: 2733415 - View products that this article applies to.
Consider the following scenario:
Source: MSExchange Autodiscover
Event ID: 1
Task Category: Web
Description: Unhandled Exception "User setting 'PreferredSite' is not available."
This issue occurs because the Exchange Server 2010 Client Access server does not calculate the PreferredSite value appropriately for the Autodiscover service request from the Exchange Server 2003 user.
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/2785908/ )Description of Update Rollup 5 version 2 for Exchange Server 2010 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about Update Rollup 3 for Exchange Server 2010 SP2, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/2685289/ )Description of Update Rollup 3 for Exchange Server 2010 Service Pack 2
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.
Article ID: 2733415 - Last Review: December 14, 2012 - Revision: 5.0