Each virtual or dedicated hosting machine has its own Operating System and works independently from the hosting servers of other customers. Updating the Operating system is frequently neglected, but doing that may have lots of advantages for your sites. The most essential reason to use the newest version is that patches are usually released to fix security holes inside 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 get access to your content. OS updates are also released for much better efficiency of the system in general and for better compatibility with the hardware available on the market, which could immediately impact the performance of your websites. If the functionality and the security of your scripts is the reason to update them, you may also know that their latest versions require an updated Os in order to work properly, therefore keeping the OS up-to-date is always recommended.