Each and every virtual or dedicated server has its own Operating System and works separately from the hosting servers of other customers. Updating the OS is usually neglected, but doing that might have quite a lot of advantages for your internet sites. The most important reason to use the most recent version is that patches are usually released to deal with security holes inside the Os code, so if you don't install the updates, you risk individuals with destructive intentions to exploit these holes and to gain access to your content. OS updates are also released for much better functionality of the system as a whole and for far better compatibility with the hardware available on the market, which could directly affect the performance of your sites. If the performance and the security of your scripts is the reason to update them, you may also discover that their most recent versions require an updated Operating System to be able to function effectively, thus keeping the Operating system up-to-date is always recommended.