Topic Last Modified: 2010-02-16

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager includes a performance data collection engine that is used to query performance counter objects on computers running Exchange 2010. For this Operations Manager rule, data is collected by using the performance counter specified in the Details table.

To review the value of the performance counter that generated this alert, in Operations Manager, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.


Product Name


Product Version

14.0 (Exchange 2010)

Object Name

MSExchangeTransport Queues

Counter Name

Active Remote Delivery Queue Length

Instance Name


Sample Interval


Server Role

Ex14. Hub Transport

Warning Threshold


Rule Path

Microsoft Exchange Server/Exchange 2010/Hub Transport/Transport Queues

Rule Name

Active Remote Delivery Queue Length - sustained for 5 minutes - Yellow(>200) - Hub Transport.


Active Remote Delivery Queue Length is the number of items in the active remote delivery queues.

This alert indicates that more than 200 messages have been in the Active Remote Delivery Queue for more than 5 minutes.

For information queues, see Understanding Transport Queues.

User Action

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

  • Use the Exchange Mail Flow Troubleshooter to troubleshoot this issue. When running the tool, under What Symptom are you seeing, click Messages are backing up in one or more queues on a server. The Mail flow Troubleshooter is located under the Toolbox node of the Exchange Management Console.

  • 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 alert.

  • Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, 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 Technical Support, be sure to review your organization's guidelines first.

For More Information

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.