The Address Book custom properties couldn't be parsed. Invalid file "%1" Line number = %2 Position = %3 Message = "%4" . ...

The Address Book custom properties couldn't be parsed. 

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

. A valid custom property file format is required for Outlook Web App to  parse it and display the values to users. If this error isn't addressed, users won't be able to view the custom properties. The Help and Support Center provides information about troubleshooting this issue.
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