After discontinuing its TouchPad tablet and all but killing WebOS, HP learned a valuable lesson: being successful in the tablet market is far more difficult than Apple makes it look. When HP launched launched the TouchPad tablet in July, the company surely thought that its future was assured as a tablet contender. Yet, like HP, many of the companies struggling to break into the tablet space seem lost. And, in their race to carve out consumer market share, most of the tablet vendors have pretty ignored the needs of the enterprise. In fact, just about every prominent firm -- including Apple -- is making mistakes when it comes to understanding what CIOs need from the tablet format. Here's how these 10 companies have missed the mark for CIOs.