What is the simplest way to allow anonymous file upload under iis 7.0?

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http://serverfault.com – I have created a separate upload website (no web pages, just a place where HTTP POST can be used) and its associated directory. I set the dir's permissions to allow r/w for network services. I can download files from the dir just fine. When I try a upload a file I get a 404 error. These files are small 1K or less text files. By my guess it should work but I can't seem to get IIS to play along... Thanks... (HowTos)