Each virtual or dedicated server has its own Os and operates separately from the hosting machines of other clients. Updating the OS is usually neglected, but doing that might have lots of advantages for your websites. The most significant reason to use the most up-to-date version is that patches are usually released to fix security holes within the Os code, so if you do not install the updates, you risk individuals 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 can instantly impact the performance of your websites. If the efficiency and the security of your scripts is the reason to update them, you may also discover that their most recent versions require an updated Os in order to operate properly, so keeping the Operating system up-to-date is always a good idea.