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A year after Apple debuted the iPod in 2001 as an accessory that it had hoped would buoy Mac sales, the company realized the iPod had much greater mass market potential and decided to make it compatible with Windows computers as well. That development combined with the 2003 opening of the iTunes Music Store selling songs for 99 cents set the iPod on a course to become one of the best-selling consumer electronics products of all time.
Photo credit: Apple
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