Topic Last Modified: 2010-07-05

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Common Components/Hub Transport and Edge Transport/Transport

Rule Name

Microsoft Exchange Transport is rejecting messages because the available disk space has dropped below the configured threshold.


This Warning event occurs if the available space on the hard disk is below the threshold that was configured on the computer that is running the Edge Transport server role or the Hub Transport server role. If the available space is below the threshold that has been configured for the server, messages are rejected by the Transport server.

User Action

To resolve this problem, verify that the hard disk contains more free space than the threshold that has been configured for the Transport server.

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.