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I keep seeing the above two log entry extracts (useragent and IP) on a daily basis. The IP appears to belong to a ISP's customer but what is the product? I've never heard of either one of these products from MS and a Google search of MS returned no results.
UPDATE: A Google search done the right way :) does turn up results. I have my answers now and wish there were a way to delete this.
You could read about WebDav here:
There are some worms exploiting this feature in Office 2000, so you might want to keep on the lookout for those UA strings.