Event ID - 91

Event Id91
SourceMSExchangeCCMC
DescriptionAttempts to register for notification failed. The index of the registry is <name>. Startup cannot continue.
Event InformationA notification is a signal from the operating system that an event has occurred. This could be a timer event or a system event. An application registers a notification for an event and the system generates a notification when the event occurs. Examine the registry for problems related to this issue. If the problem persists, stop the Exchange System Attendant service and restart Exchange server. WARNING Do not use the registry editor to edit the registry directly unless you have no alternative. The registry editors bypass the standard safeguards provided by administrative tools. These safeguards prevent you from entering conflicting settings or settings that are likely to degrade performance or damage your system. Editing the registry directly can have serious, unexpected consequences that can prevent the system from starting and require that you reinstall Windows 2000. To configure or customize Windows 2000, use the programs in Control Panel or Microsoft Management Console (MMC) whenever possible.
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