Every virtual or dedicated server has its own Os and operates separately from the hosting servers of other clients. Updating the OS is usually overlooked, but doing that could have quite a lot of advantages for your websites. The most important reason to employ the latest version is that patches are typically released to repair security holes within the Operating System code, so if you do not install the updates, you risk individuals with malicious intentions to exploit these holes and to get access to your content. Operating system updates are also released for much better efficiency of the system as a whole and for better compatibility with the hardware on the market, which could instantly affect the performance of your websites. If the functionality and the security of your scripts is the reason to update them, you may also discover that their newest versions require an updated Os in order to function properly, consequently keeping the OS up-to-date is always a good idea.