Event ID - 9643

Event Id9643
DescriptionProcess termination function %1 was called by a function in module %2; some parameters and their values were %3. A significant section of the call stack is in the data section. %n%n For more information, click http://www.microsoft.com/contentredirect.asp.
Event InformationAccording to Microsoft:
Unfortunately, there are still cases when an information store silent exit can occur, such as a stack overflow. To diagnose these situations you must attach a debugger to the store process. However, there are cases where it may appear that the information store has experienced a silent exit, when actually the process was terminated by the following means:
1. During Cluster service failover the Information Store did not shutdown in the resource timeout allotted and had to be forcefully terminated to force the cluster failover.
2. User intervention required a forceful exit of the information store process, such as running Kill.exe. A supported hotfix is now available from Microsoft, but it is only intended to correct the problem. Only apply it to systems that are experiencing this specific problem.
Reference LinksUnderstanding and catching silent exits of the Exchange Information Store in Exchange 2000 Server and in Exchange Server 2003

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