Topic Last Modified: 2010-02-15

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/Mailbox/System Attendant

Rule Name

Unable to generate a unique e-mail address type.


This Error event indicates that a unique e-mail address of one of the valid address types could not be generated for a specific user.

User Action

To resolve this error, follow one or more of these steps:

  1. Examine the e-mail address policies associated with the address type shown in the error.

  2. Use the rules for the specific address type to calculate the e-mail address that would be produced for the user who is identified in the error.

  3. Search Active Directory for the e-mail addresses that you calculated in the previous step.

  4. When the duplicate user is identified, manually set one of the e-mail addresses to be unique. Alternatively, calculate a different e-mail address rule for the address type listed in the error to prevent duplicates in future operations.

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.