Each virtual or dedicated hosting server has its own Operating System and works independently from the hosting machines of other customers. Updating the OS is often overlooked, but doing that may have a wide range of advantages for your sites. The most essential reason to use the most up-to-date version is that patches are usually released to deal with security holes in the Os code, so if you do not 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 improved efficiency of the system as a whole and for better compatibility with the hardware on the market, which can instantly impact the performance of your internet sites. If the efficiency and the security of your scripts is the reason to update them, you might also find out that their most recent versions require an updated Os to be able to operate properly, thus keeping the Operating system up-to-date is always a good idea.