I'm forced to build a site on IIS-based hosting. I have a problem with different image styles (thumbnails etc.) not being generated when uploading an image using image field on a node. The original image gets uploaded and works normally, but other styles don't. To clarify - Drupal gives me a permission error (not allowed to view this page), but the image also doesn't appear on the server, I checked via FTP.
I found Image styles not generated with Drupal 7 on IIS 6 which seemed like a very similar issue, but provided solutions did not help.