Each and every virtual or dedicated server has its own Operating System and operates independently from the servers of other customers. Updating the Operating system is often ignored, but doing that may have a wide range of advantages for your sites. The most important reason to use the newest version is that patches are usually released to deal with security holes within the Os code, so if you do not install the updates, you risk people with harmful intentions to take advantage of these holes and to get access to your content. OS updates are also released for improved functionality of the system as a whole and for far better compatibility with the hardware available on the market, which could instantly affect the functionality of your sites. If the efficiency and the security of your scripts is the reason to update them, you may also discover that their most up-to-date versions require an updated Os in order to operate effectively, consequently keeping the OS up-to-date is always a good idea.