I recently ran into a problem where I needed to read a few IIS logs to find out the number of visits during the day. The tool I wanted to use was AWStats, a free log file analyzer tool that can create some handy reports.
If you need to read an IIS log file where the admin has set up a custom log method, this tool for AWStats is very handy: in the top of your IIS log file it states which are the variables it uses. By selecting these on the web page, you get a custom awstat log format line that you can just copy / paste into your awstat config lines.
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