Event ID - 9187

Event Id9187
DescriptionMicrosoft Exchange System Attendant failed to add the local computer as a member of the DS group object name. Please stop all the Microsoft Exchange services, add the local computer into the group manually and restart all the services.
Event InformationExplanation :
This event indicates that the System Attendant has detected that the local computer is not a member of the Exchange Domain Servers Security Group and failed to add it to that group.
While there may be other causes of this error, it can happen because the Distinguished Name (DN) of the Server has changed. This change in the DN can happen because the computer may have been moved to another organizational unit (OU) in Active Directory. This error may show up if even if the server is in the Exchange Domain Servers Security Group. 

User Action :
Stop all Exchange services. If necessary, add the local computer to the Exchange Domain Servers Security Group and restart the System Attendant Service manually. Note that this will cause the Information Store service to restart. </p>
Reference Links System Attendant Generates 9186 and 9187 Event ID Messages

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