@jbarry One of the Add-Ons that needs to be deployed with the App for Exchange is "TA-Windows--Exchange-IIS". You'll find these Add-Ons in the appserver\addons folder of the App for Exchange package.
Inside the respective add-on for your OS, you'll find an inputs.conf file in the default folder. This conf file is configured to monitor the following path for IIS logs by default: "C:\WINDOWS\system32\LogFiles\W3SVC1\W3SVC1*.log"
If your IIS logs are in a different place, you can make a copy of this monitoring stanza, create a new inputs.conf file in the local folder of the app, and paste in the modified stanza here to overwrite the default settings.