Less CSS and IIS 7

In case you are using Less CSS to generate CSS markups, IIS won’t find your .less files by default. You will get a 404 Not Found error. The problem is the missing MIME type.

The solution is simple, just register the MIME type for .less in web.config:

<system.webServer>
  <staticContent>
    <mimeMap fileExtension=".less" mimeType="text/css"/>
  </staticContent>
</system.webServer>