Product Name	Exchange
Product Version	14.0 (Exchange 2010)
Alert Type	Error
Rule Path	Microsoft Exchange Server/Exchange 2010/Common Components/Internal Role Services Monitoring
Rule Name	The Microsoft Exchange Active Directory Topology Service (MSExchangeADTopology) isn't running.

This Error event indicates that the Microsoft Exchange Active Directory Topology service (MSExchangeADTopology) is not running. This service provides Active Directory topology information to several Exchange Server components.

To resolve this problem, start the Microsoft Exchange Active Directory Topology service. To do this, follow these steps.

Start the Microsoft Exchange Active Directory Topology service

1. Click Start, click Run, type services.msc, and then click OK.

Here are some recommended next steps to learn more about this alert:

• Review the Application log and System log on the Microsoft Exchange Server 2010 servers for related events. For example, events that occur immediately before and after this event may provide more information about the cause of this error.
  
  
• To review detailed information about the cause of this alert, use the Operations Console in Operations Manager. For more information, see the "Introduction" section in this topic.
  
  
• Make sure that the other required Exchange 2010 services are running. Review the Client Access Servers (CAS) Active Alerts view to determine whether alerts that are related to stopped services are logged on the CAS server.
  
  
• Resolve the problem by using self-support options, assisted support options, and other resources. You can access these resources at the Exchange Server Solutions Center. On this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base and posting a question at the Exchange server forums. Or, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Customer Support Services, make sure that you 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.