Each virtual or dedicated server has its own Os and operates independently from the servers of other customers. Updating the Operating system is often neglected, but doing that could have quite a lot of advantages for your sites. The most essential reason to employ the most recent version is that patches are usually released to repair security holes in the Os code, so if you don't install the updates, you risk individuals with malicious intentions to exploit these holes and to get access to your content. OS updates are also released for much better functionality of the system as a whole and for better compatibility with the hardware available on the market, which could immediately influence the performance of your internet sites. If the efficiency and the security of your scripts is the reason to update them, you may also find out that their newest versions require an updated Operating System so as to operate properly, consequently keeping the OS up-to-date is always recommended.