A simple way is to use Performance Monitor. Hook to MSExchange OWA and the add current user. It doesn’t tell you who, but it will at least give you a count. In my example I have the Exchange tools loaded on my desktop so within Performance Monitor on that remote machine I was able to add that one counter four times to four of the CAS servers to get an overall picture. It will also show you if your load balancer is working properly.
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