I'm seeing some warning messages regarding a performance counter for the MSExchange Calendar Attendant\Average Calendar Attendant Processing time on a few mailbox servers. According to Microsoft guidance this "Should be a low value at all times. High values may indicate a performance bottleneck." However, what is an acceptable low value?
WARNING event detected at 07/01/2013 09:48:43.
Perfmon counter Object: 'MSExchange
Calendar Attendant'; Counter: 'Average Calendar Attendant Processing
Time' exceeded threshold of 100.00, currently 171.20.
(nmExchCalendarProcessTime)