Which of these products was considered a commercial failure when first launched, selling only 10,000 units in its first year, but eventually became a billion-dollar success?

Product launches don't always go as planned, and sometimes what seems like a failure becomes an unexpected success story. This trivia question explores a famous product that initially appeared to be a commercial disaster but eventually revolutionized its market segment. Test your knowledge of notable product launch turnarounds in business history!

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Apple's iPod (2001)
Microsoft's Xbox (2001)
Amazon's Kindle (2007)
Samsung's Galaxy smartphone series (2009)