Microsoft Exchange Troubleshooting Assistant reporting excessive user RPC activity

I am running Exchange 2003 SP2 enterprise on Windows server 2003. There are 80 users running Outlook 2003

Recently, i have noticed that Outlook is slow to respond and often reports that it is waiting to communicate with the exchange server.

I have downloaded exTRA and run performance troubleshooter. It has reported that i have extremely high RPC Operations per second. The scan was run on a sunday morning when there were only 2 users logged on. When i logged one the users off and re run the scan i don't get the warning. This particular user has a large mailbox (3GB), does not have cached exchange mode enabled and also uses google desktop. However he is also an awkward senior employee so unless i can have some cast iron evidence he is causing the problems there is not a lot i can do.

Can anybody advise whether there are other tools i can use to pin point what my problem may be?
metamaticAsked:
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James MontgomeryCommented:
Sounds like you have found the problem, but of course some issues are social and not technical!

You can do some more investigating as per these articles to help strengthen your opinion.

http://msexchangeteam.com/archive/2005/09/28/411674.aspx
http://technet.microsoft.com/en-us/library/aa997879(EXCHG.80).aspx
http://technet.microsoft.com/en-us/library/aa997927(EXCHG.80).aspx
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metamaticAuthor Commented:
many thanks
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