Windows OS (Score 3, Insightful)

The operating system is focused on when installing/uninstalling programs and peripherals which for the average user may account for a relatively small amount of time vs. checking e-mail, surfing the web and writing documents. Therefore, most of the time, people are using applications instead of the OS. In this case, the most important feature of the OS is stability. For virtually everyone I know, XP home and professional reached a reasonable level of stability.