Every virtual or dedicated server has its own Os and works separately from the hosting servers of other clients. Updating the OS is often ignored, but doing that may have a wide range of advantages for your internet sites. The most essential reason to employ the newest version is that patches are typically released to fix security holes inside the Os code, so if you don't install the updates, you risk people with malicious intentions to exploit these holes and to get access to your content. OS 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 could directly influence the efficiency of your internet sites. If the functionality and the security of your scripts is the reason to update them, you may also find out that their newest versions require an updated Os to be able to operate properly, thus keeping the Operating system up-to-date is always a wise idea.