Exchange RPC "errors" using Exchange Troubleshooting Assistance

I have som big problems with Exchange 2003 SP2 installed on a Windows 2003 sp1 cluster with 2 nodes. The exchagen data is placed on a EVA6000 SAN.
We have logged tha SAN and it seems like there was many many IO's too many I think.
I have tried to use Exchange Troubleshooting Assistance and it came up with following report.

Performance Issues Found  
Time Range:: 03/05/2007 09:55:56 - 03/05/2007 10:15:56  
 
Area:: RPC Performance Counters  
 
  High user RPC activity Time Range:: 03/05/2007 09:55:56 - 03/05/2007 10:15:56
 Since the RPC operations per second per user is greater than 0.25, the RPC operations per second rates indicate a user or users on this server are unusually active. The measured RPC operations per second per user rate is 0.296.  
  Tell me more about this issue and how to resolve it.  
 
Time Range:: 03/05/2007 10:16:06 - 03/05/2007 10:36:06  
 
Area:: RPC Performance Counters  
 
  High user RPC activity Time Range:: 03/05/2007 10:16:06 - 03/05/2007 10:36:06
 Since the RPC operations per second per user is greater than 0.25, the RPC operations per second rates indicate a user or users on this server are unusually active. The measured RPC operations per second per user rate is 0.3.  
  Tell me more about this issue and how to resolve it.  
 
Time Range:: 03/05/2007 10:36:16 - 03/05/2007 10:56:16  
 
Area:: RPC Performance Counters  
 
  High user RPC activity Time Range:: 03/05/2007 10:36:16 - 03/05/2007 10:56:16
 Since the RPC operations per second per user is greater than 0.25, the RPC operations per second rates indicate a user or users on this server are unusually active. The measured RPC operations per second per user rate is 0.298.  
  Tell me more about this issue and how to resolve it.  
 
  The variation in RPC latency is greater than 10%. Time Range:: 03/05/2007 10:36:16 - 03/05/2007 10:56:16
 The variation in RPC latency is greater than 10%.
 
Time Range:: 03/05/2007 10:56:26 - 03/05/2007 11:16:26  
 
Area:: RPC Performance Counters  
 
  Active RPC user activity Time Range:: 03/05/2007 10:56:26 - 03/05/2007 11:16:26
 Since the RPC operations per second per user is greater than 0.15, the users are considered as 'moderately active'. The measured RPC operations per second/per user rate is 0.171.
  Tell me more about this issue and how to resolve it.  
 
Time Range:: 03/05/2007 11:16:36 - 03/05/2007 11:36:36  
 
Area:: RPC Performance Counters  
 
  Active RPC user activity Time Range:: 03/05/2007 11:16:36 - 03/05/2007 11:36:36
 Since the RPC operations per second per user is greater than 0.15, the users are considered as 'moderately active'. The measured RPC operations per second/per user rate is 0.232.
  Tell me more about this issue and how to resolve it.  
 
Time Range:: 03/05/2007 11:36:46 - 03/05/2007 11:55:46  
 
Area:: RPC Performance Counters  
 
  Active RPC user activity Time Range:: 03/05/2007 11:36:46 - 03/05/2007 11:55:46
 Since the RPC operations per second per user is greater than 0.15, the users are considered as 'moderately active'. The measured RPC operations per second/per user rate is 0.151.
  Tell me more about this issue and how to resolve it.  


The Assistance also refer to this article:
http://www.microsoft.com/technet/prodtechnol/exchange/Analyzer/24bf01bd-6580-450c-9d3e-478b3c0cdc16.mspx?mfr=true
What should I do?
Morten