Microsoft Exchange System Attendant failed to read the membership of the universal security group ‘%1’; the error code was ‘%2’. The problem might be that the Microsoft Exchange System Attendant does not have permission to read the membership of the group. If this computer is not a member of the group ‘%1’, you should manually stop all Microsoft Exchange services, run the task ‘add-ExchangeServerGroupMember,’ and then restart all Microsoft Exchange services.

This Error event indicates that the Microsoft Exchange System Attendant service was unable to read the membership of a universal security group. Another symptom you may experience when this event occurs is the presence of event ID 9187.

This event may be caused if the Microsoft Exchange System Attendant service does not have the necessary permissions in the Active Directory directory service. There is no add-ExchangeServerGroupMember cmdlet. Use the Exchange Management Console to add the server to the Exchange Servers security group.

To resolve this error, do one or more of the following:

• Verify that the computer is part of the Exchange Servers security group. If this computer is not a member of the Exchange Servers security group, stop all Microsoft Exchange services, add this computer to the Exchange Servers security group, and then restart all Microsoft Exchange services.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.