Every virtual or dedicated hosting machine has its own Os and works independently from the servers of other customers. Updating the Operating system is usually ignored, but doing that could have quite a lot of benefits for your websites. The most significant reason to use the latest version is that patches are frequently released to repair security holes within the Operating System code, so if you do not install the updates, you risk people with destructive intentions to take advantage of these holes and to gain access to your content. OS updates are also released for enhanced functionality of the system overall and for far better compatibility with the hardware on the market, which could instantly influence the functionality of your sites. If the performance and the security of your scripts is the reason to update them, you might also discover that their most up-to-date versions require an updated Operating System to be able to operate properly, consequently keeping the Operating system up-to-date is always recommended.