Each and every virtual or dedicated server has its own Os and functions separately from the hosting servers of other clients. Updating the Operating system is frequently neglected, but doing that could have a wide range of advantages for your sites. The most important reason to employ the most up-to-date version is that patches are frequently released to repair security holes inside the Operating System code, so if you do not install the updates, you risk people with malicious intentions to exploit these holes and to gain access to your content. OS updates are also released for much better efficiency of the system as a whole and for much better compatibility with the hardware on the market, which could immediately affect the performance of your sites. If the efficiency and the security of your scripts is the reason to update them, you may also discover that their newest versions require an updated Operating System in order to work effectively, so keeping the OS up-to-date is always a wise idea.
