"In this case study we want to help designers and developers who are familiar with iOS to reimagine their apps using Metro style design principles," says the blog. "We show you how to translate common user interface and experience patterns found in iPad apps to 8 Metro style apps."

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Why would anyone want to do that? "To learn more about the business opportunity of Windows 8, see Selling Apps," the posting says early on. Ultimately that leads to a "With successful apps on Windows, you'll make more money than the industry standard, earning 80% of every customer dollar, after an app makes more than 25,000 USD in sales. For the first 25,000 USD of an app's sales, you get the industry-standard 70%."

Money aside, the case-study post shows how an iPad photo journal application was adapted to fit with Metro style. Both Windows 8 and iOS on iPads cater to touch commands and navigation, but where iPads rely on icons and toolbars, Windows 8 centers around words on tiles and hiding toolbars.