Each and every virtual or dedicated hosting server has its own Operating System and works independently from the hosting machines of other customers. Updating the OS is often neglected, but doing that may have lots of benefits for your sites. The most important reason to employ the newest version is that patches are usually released to fix security holes within the Os code, so if you do not install the updates, you risk people with harmful intentions to take advantage of these holes and to gain access to your content. Operating system updates are also released for improved efficiency of the system as a whole and for far better compatibility with the hardware on the market, which could instantly affect the performance of your websites. If the efficiency and the security of your scripts is the reason to update them, you might also know that their most up-to-date versions require an updated Os in order to work properly, therefore keeping the OS up-to-date is always a wise idea.