Microsoft Exchange Client Access Server Exchange Address Book counters

The following table shows Exchange Address Book load counters.

Counter Name	Description
MSExchangeAB\NSPI Connections Current
MSExchangeAB\NSPI Connections/sec	Shows the number of NSPI client connections established to the server each second.
MSExchangeAB\NSPI RPC Requests/sec	Shows the rate at which NSPI requests occur each second.
MSExchangeAB\Referral RPC Requests/sec	Shows the rate at which referral requests occur each second.