Hi,
According to my knowledge, the error message indicates that the recipient object specified in the event description is in an inconsistent state.
To resolve this warning, please follow these steps below:
First, please increase diagnostic logging so that you can determine which attributes or properties contain invalid values.
Specifically, increase the diagnostic logging level on the Validation counter of the MSExchangeADAccess performance object.
You can increase logging by running the following Exchange Management Shell cmdlet: Set-EventLogLevel MSExchangeADAccess\Validation -Level High.
Secondly, please review the additional MSExchangeADAccess events in the Application log to determine which attributes or properties contain invalid values.
Note: After you have completed troubleshooting this issue, return logging to the default level by running the following cmdlet: Set-EventLogLevel MSExchangeADAccess\Validation -Level Lowest.
For detailed information about increasing logging, see
http://technet.microsoft.com/en-us/library/3030124a-ac14-4d45-afc0-a06b9ce9ce39.aspx.
Best regards,
Belinda