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The following error message appears when using AppInsight for Exchange:
Performance counter not found.
The performance counter is broken.
Repair the counter using the following steps:
Note: The files provided in this solution are valid for Exchange 2013 (V15). The missing files will depend on the missing category. find the appropriate tuple of (missing) files in the DVD:\Setup\Perf folder.
NOTE: If the above still doesn't resolve it, you many need to rebuild performance counters on the machine:
For more information, you can refer to the MSExchangeIS Mailbox Performance monitor object is not available article in Microsoft website.