The specified file is used to configure a list of custom properties on users’ Active Directory objects. These objects will be shown on the Microsoft Office Outlook Web App user properties page. This Event error indicates that a required attribute is missing from the specified custom properties file or that the attribute is in the wrong position in the file.

To resolve this error, do one or more of the following:

• Open the specified file and add the missing attribute.
  
  
• Open the specified file and check to see if the attribute is present. If the attribute is present, but in the wrong position, move it to the correct position.
  
  
• Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.
  
  

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.