Microsoft Exchange Performance Counters

Microsoft Exchange Mailbox Server Mailbox Assistant counters

The following table shows mailbox assistant counters.

Counter Name	Description
MSExchange Assistants(*)\Average Event Processing Time in Seconds
MSExchange Assistants(*)\Events in queue	Shows the number of events in the in-memory queue waiting to be processed by the assistants.
MSExchange Assistants(*)\Events Polled/sec	Shows the number of events polled per second. Determines current load statistics for this counter.
MSExchange Assistants(*)\Mailboxes Processed/sec	Shows the rate of mailboxes processed by time-based assistants per second. Determines current load statistics for this counter.
Process(MSExchangeMailboxAssistants)\%Processor Time	Shows the amount of processor time being consumed by mailbox assistants.