This Error event indicates that a forms registry inherits from another forms registry and also defines a base experience. When a forms registry inherits from another one, it inherits the base experience of the forms registry from which it inherits and cannot define a base experience of its own. For example, if Registry A inherits from Registry B, it inherits the base experience from Registry B and cannot have its own base experience.

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

• If you want to use the inherited base experience, open the forms registry that is set to inherit and remove its base experience.
  
  
• If you want to keep the base experience, open the specified forms registry and remove the inheritance.
  
  
• Contact a Microsoft Support professional to resolve this issue. To contact a Microsoft Support professional, visit the Exchange Server Solutions Center. In the navigation pane, click Assisted Support Options and use one of the assisted support options to contact a Microsoft Support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.
  
  

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.