Each and every virtual or dedicated server has its own Operating System and operates independently from the hosting machines of other customers. Updating the OS is frequently ignored, but doing that might have quite a lot of benefits for your sites. The most important reason to employ the most recent version is that patches are frequently released to deal with security holes in the Os code, so if you don't install the updates, you risk people with malicious intentions to exploit these holes and to access your content. Operating system updates are also released for improved performance of the system as a whole and for better compatibility with the hardware available on the market, which can immediately influence the efficiency of your sites. If the functionality and the security of your scripts is the reason to update them, you may also discover that their most recent versions require an updated Operating System so as to function effectively, so keeping the Operating system up-to-date is always a good idea.
