Each and every virtual or dedicated hosting machine has its own Operating System and works independently from the hosting servers of other customers. Updating the OS is often ignored, but doing that might have quite a lot of advantages for your sites. The most important reason to employ the most up-to-date version is that patches are usually released to deal with security holes within the Os code, so if you do not install the updates, you risk individuals with destructive intentions to take advantage of these holes and to gain access to your content. OS updates are also released for improved performance of the system in general and for much better compatibility with the hardware on the market, which could instantly affect the functionality of your internet sites. If the performance and the security of your scripts is the reason to update them, you may also know that their newest versions require an updated Operating System to be able to function properly, so keeping the OS up-to-date is always a wise idea.