This Event error indicates that the Address List Service could not be initialized because the entry point could not be found in file specified in the event description. This error may be triggered by multiple causes. Similarly, the method by which you resolve this error depends on what triggered this event in your particular Exchange organization.

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

• Review the System and Application event logs for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.
  
  
• Verify that the file referenced in the error exists and that the system account has a minimum of Read permissions on the file and folder where the file exists.
  
  
• If you cannot resolve this issue, or you experience other problems or mail flow interruptions in your Exchange organization, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.
  
  

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.