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Any - Exchange 2003+ - ExMon user process monitor

Any software title released for Windows. Articles are posted in "Windows Version - Software Title - Subject" format.

Any - Exchange 2003+ - ExMon user process monitor

Postby lmmtux » Tue Aug 14, 2012 11:43 am

Exchange 2003+ has a widely unknown process monitor called ExMon which can be very useful for troubleshooting Exchange performance issues. The limitation is that it will only show MAPI traffic (used by Outlook mostly or other MAPI compatible email clients), however since Outlook is commonly used with Exchange this can be a very useful tool. It can show:

  • Client connections and their IP address
  • CPU usage
  • CPU latency
  • Bytes transferred

I've used it to pinpoint high CPU usage on an Exchange 2010 SP1 server which ended up being caused by an iPhone client.

Interface of ExMon looks like this:
exmon_screenshot.gif (24.13 KiB) Viewed 2713 times


You must download ExMon (http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=11461) and install it on the Exchange server (installing it on the Front End server (or CAS server for Exchange 2007+) if you have one is recommended).

Run the "ExMon.reg" file in the installation directory which will import a couple of keys necessary for ExMon to work. This may become automatic in future versions of the tool.


Run ExMon.exe from the installation directory (commonly C:\Program Files\ExMon).

You will see 3 tabs in the main interface. They are:

  • By User : Displays data by user and resources they consume.
  • By Version : Displays data by the MAPI version used.
  • By Clientmon : Displays data for Outlook 2003+

Collecting and Exporting data:

Data from ExMon can be collected to the .etl files in the ExMon installation directory using command line options. See documentation in the ExMon installation directory for more info.

Data from ExMon can be exported to Excel with the command "ExMon.exe -su", for example:

Code: Select all
ExMon.exe -su "c:\program files\exmon\data\byuser.csv"
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