Hi We are running Exchange 2003 SP2 and Exchange 2007 SP1 servers. All servers are Windows 2003 SP2. One of our departments (Marketing) is looking into an application that will connect directly with Exchange and manipulate some information in the selected users' mailboxes. In order to carry this out, it will carry out a MAPI check on each mailbox periodically and, if certain conditions are met, it will carry out some task. We are working with the Marketing IT people on this, and we would like to know the effect this applicatoin will have on our Exchange mailbox servers. Apart from CPU and memory, can anyone suggest any useful counters - particularly Exchange specific ones - to monitor? Would it be useful to monitor IOPS in this case? How about RPC Latency? Any help appreciated!

I would use Exmon installed on the server and then have them run their app and run a trace over some period of time and see how much CPU % , sessions etc are being used by the app.

Please measure the performance of the exchange server before using the application, and then compare the statistics after deploying the application Exchange 2003: Understanding Exchange Performance Performance Counter Definitions Exchange 2007: Monitoring Without System Center Operations ManagerJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com