Each and every virtual or dedicated server has its own Operating System and works separately from the hosting servers of other customers. Updating the Operating system is frequently ignored, but doing that could have a wide range of benefits for your websites. The most significant reason to use the most up-to-date version is that patches are usually released to fix security holes within the Os code, so if you don't install the updates, you risk people with harmful intentions to take advantage of these holes and to gain access to your content. OS updates are also released for much better efficiency of the system overall and for better compatibility with the hardware available on the market, which can instantly affect the efficiency of your websites. If the performance and the security of your scripts is the reason to update them, you may also discover that their latest versions require an updated Operating System to be able to operate effectively, therefore keeping the OS up-to-date is always recommended.