When we think about the technology world, we often spend our time discussing the hugely popular products. We examine how Windows became so popular, and talk about the way in which the iPhone and iPad have changed the world. The products that fail, or in some way disappoint customers, are typically left out of discussions. Every now and again, though, it's worth examining those devices and services that couldn't make the grade, and discuss why they failed. Most of the items featured here managed to survive longer than celebrity Kim Kardashian's 72-day marriage to Nets basketball player Kris Humphries. But all of them were ultimately doomed. In some cases, it was simply a matter of being ahead of the times. But for others, the failures were due mainly to the trouble the companies had in proving to customers -- both consumers and enterprise users -- that the products were worth trying out. Herewith, our list of 10 epic tech failures. Some may surprise you, and others may bring back ugly memories. Let's see what we can learn from these mistakes.