The operating system (OS) in your device is as vital to it as your blood is to you. Without an OS, any device is essentially just a shell. Every new device that you buy comes with an OS, usually the latest version from the manufacturer you have selected. When you get the device, you get the OS. That is the good news. The question marks start appearing at the same time as the little pop-up window in the corner of your screen that tells you it is time to upgrade your OS. Here are some of the pros and cons of moving to the latest version of your OS.