Find out how many users are logged into Exchange

From the Windows 2008 server, how can I determine how many users are currently logged into Outlook 2007/2010/2013 from their local desktops or from the RDS server.

This is for a Windows 2008 R2 domain running AD, Exchange 2007 with 50 local desktops and an RDS /Terminal Server with 15 remote users.  Everything is onsite.
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Tony GiangrecoAsked:
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Alexei KuznetsovMicrosoft Outlook MVPCommented:
Easy with PowerShell:
Get-Counter "\MSExchange RpcClientAccess\User Count"
Get-Counter "\MSExchange OWA\Current Unique Users"

Open in new window

First command will show the number of active RPC sessions (like Outlook), second will show you the number of active OWA users.
Tony GiangrecoAuthor Commented:
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