I had a friend in high school who was obsessed with the Microsoft Zune and would constantly talk about how much better it was than the iPod and iTunes. That was around 2008. The Zune was discontinued three years later, in October 2011, whereas iTunes is still around.
But that doesn't mean that Apple is immune to failure. Remember iTunes Ping? I honestly don't, even though I was a heavy iTunes user at the time of its launch in 2010. It was apparently a music-based social networking service. And it was discontinued in 2012. Check out the slideshow for other flops in tech history!