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AppInsight for Exchange is missing a performance counter or are not loading properly.
Note: The files provided in this article are valid for Microsoft 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.
For more information, you can refer to MSExchangeIS Mailbox Performance monitor object is not available.
This is caused by broken or missing performance counters.