This Error event indicates that the Microsoft Exchange Server 2007 transport routing engine can't find any bridgehead servers for the specified routing group connector.
Routing group connectors are used in Exchange 2007 for Hub Transport servers to communicate with Exchange 2000 Server or Exchange Server 2003 bridgehead servers.
For more information, see Message Routing in a Coexistence Environment.
To resolve this error, follow one or more of these steps:
Verify that the specified routing group connector exists.
Verify that the routing group that is serviced by the specified routing group connector contains an Exchange 2000 or Exchange 2003 bridgehead server that is reachable on the network.
Review other related Error and Warning events in the Application log. These related events may help you find the root cause of this error.
If the recommended steps do not resolve this error, contact Microsoft Customer Support Services. For more information about how to contact support, visit the Microsoft Help and Support Web site.
If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.