<p>Well, looks like I answered my own question.</p> <pre class="prettyprint"><code>LogParser.exe -i:IISW3C "SELECT COUNT(cs(User-Agent)) AS Client FROM *.log WHERE STRLEN(cs(User-Agent)) > 100" </code></pre>

How do I use LogParser to find out the LENGTH of a field in an IIS Log?

Well, looks like I answered my own question.

LogParser.exe -i:IISW3C 
"SELECT COUNT(cs(User-Agent)) AS Client 
FROM *.log WHERE STRLEN(cs(User-Agent)) > 100"

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