|Source:||MSExchange Unified Messaging|
|Message:||The Microsoft Exchange Unified Messaging service failed to failed to create an instance of the Unified Messaging Worker Process. %1|
This Error event indicates that the Microsoft Exchange Unified Messaging Service was stopped because it was not able to create a Unified Messaging (UM) worker instance to manage the UM worker process. When the Unified Messaging Service starts, a UM worker process is also started. The Unified Messaging Service initially accepts the calls sent by the IP/VoIP gateway, and then it attempts to redirect the calls to the UM Worker Process. If the UM worker process becomes unresponsive or it exceeds the lifespan, Unified Messaging Service will retire the existing UM worker process along with the resources consumed by it, and create a new UM worker process to continue processing any new requests. By creating a new process and redirecting calls to it, you can make Unified Messaging more efficient and reliable, even when the original worker process serving the requests has problems. The UM worker instance, part of the Unified Messaging Service, is the one responsible to manage the communications with, and to retrieve the health status of the worker processes. It also signals which worker process should stop or start.
This event may be caused if the Unified Messaging Service is unable to take exclusive access to a required object. For example, it may occur if the Unified Messaging Service is unable to take control of an operating system semaphore object that is used to control access to a pool of shared resources.
To resolve this error, consider the following:
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.