Every virtual or dedicated hosting server has its own Operating System and operates separately from the hosting servers of other clients. Updating the Operating system is often neglected, but doing that could have quite a lot of advantages for your internet sites. The most important reason to use the most recent version is that patches are usually released to fix security holes in 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 gain access to your content. OS updates are also released for much better efficiency of the system in general and for much better compatibility with the hardware available on the market, which could directly influence the performance of your internet sites. If the efficiency and the security of your scripts is the reason to update them, you could also know that their most up-to-date versions require an updated Os to be able to work properly, therefore keeping the Operating system up-to-date is always recommended.