Each and every virtual or dedicated hosting server has its own Operating System and works separately from the hosting servers of other customers. Updating the OS is frequently ignored, but doing that could have a wide range of advantages for your sites. The most significant reason to employ the latest version is that patches are usually released to deal with security holes inside the Os code, so if you don't install the updates, you risk people with harmful intentions to take advantage of these holes and to access your content. Operating system updates are also released for enhanced functionality of the system as a whole and for much better compatibility with the hardware available on the market, which can immediately affect the efficiency of your websites. If the efficiency and the security of your scripts is the reason to update them, you could also know that their most up-to-date versions require an updated Operating System to be able to function properly, thus keeping the Operating system up-to-date is always a wise idea.