To check connections to my CAS servers
Get-Counter “\MSExchange RpcClientAccess\User Count” -ComputerName mail1,mail2,mail3 | ft
Get-Counter “\MSExchange OWA\Current Unique Users” -ComputerName mail1,mail2,mail3 | ft

Senior IT Pro Trainer & Consultant focused on MS technologies relating to System Center Products SCCM, SCOM, SCO, SCSM