Each and every virtual or dedicated hosting machine has its own Os and operates separately from the servers of other customers. Updating the OS is usually neglected, but doing that may have quite a lot of benefits for your sites. The most important reason to employ the most recent version is that patches are typically released to repair security holes within the Operating System code, so if you don't install the updates, you risk people with malicious intentions to take advantage of these holes and to access your content. OS updates are also released for enhanced efficiency of the system overall and for better compatibility with the hardware available on the market, which could instantly influence the efficiency of your sites. If the performance and the security of your scripts is the reason to update them, you could also find out that their most recent versions require an updated Os to be able to function properly, consequently keeping the Operating system up-to-date is always recommended.