Every virtual or dedicated server has its own Os and functions independently from the hosting servers of other customers. Updating the Operating system is often overlooked, but doing that might have lots of benefits for your sites. The most important reason to use the newest version is that patches are usually released to repair security holes within the Os code, so if you do not install the updates, you risk people with harmful intentions to exploit these holes and to gain access to your content. Operating system updates are also released for much better performance of the system as a whole and for better compatibility with the hardware on the market, which can directly impact the performance of your internet sites. If the efficiency and the security of your scripts is the reason to update them, you could also discover that their most up-to-date versions require an updated Operating System so as to work effectively, so keeping the OS up-to-date is always wise.