The Outlook Web Access web application failed to parse the Address Book custom properties. Invalid file "%1" Line number ...

The Outlook Web Access web application failed to parse the Address Book custom properties. 

Invalid file "%1"  Line number = %2  Position = %3 Message = "%4"

. A valid format custom property file is a requirement for Microsoft Outlook Web Access to  parse it and display the values to the users. If this error is not addressed, users will not be able to view the custom properties. The Help and Support Center provides information about troubleshooting this issue.
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