Report of the number of similtaneous connections in Exchange 2003

Is there a way I can create or pull a report for the number of simultaneous connections (outlook, owa, etc) to our exchange 2003 server during business hours?

We need this data to help us size our exchange 2010 servers.
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warddhoogheConnect With a Mentor Commented:
MSExchangeIS\Active User Count
would probably be best for unique users count.

A good description and differences of other useful counters can be found at

Ps: Generally speaking around 11 AM and  4PM are the peak moments.
you will be able to find all you need with "performance monitor" on your exchange server.
PerimeterITAuthor Commented:
Could you be more specific as to what counters to track?

Specifically we need to know the number of unique users currently logged on
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