Every virtual or dedicated server has its own Operating System and functions independently from the hosting servers of other clients. Updating the Operating system is frequently ignored, but doing that might have a wide range of benefits for your internet sites. The most essential reason to use the latest version is that patches are typically released to fix security holes inside the Os code, so if you don't install the updates, you risk people with destructive intentions to take advantage of these holes and to access your content. Operating system updates are also released for enhanced efficiency of the system as a whole and for much better compatibility with the hardware available on the market, which could immediately affect the functionality of your sites. If the performance and the security of your scripts is the reason to update them, you may also find out that their newest versions require an updated Operating System to be able to work properly, consequently keeping the OS up-to-date is always a wise idea.