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Log Name: Application
Source: MSExchange ADAccess
Date: 12/04/2015 2:17:28 PM
Event ID: 2156
Task Category: Validation
Process w3wp.exe () (PID=4516). Recipient object CN=dummy user2,OU=Old Employees,DC=domain,DC=com
read from DC2k3-02-VM.domain.com failed validation. A data validation exception will be given. Set event logging level for Validation category to Expert to get additional events about each failure.