Debian is a Linux release, that's preffered for desktop machines, yet it has been becoming more popular as a server OS over the last few years as well. It is really stable and safe, due to the fact that fixes are released in a couple of days after an issue is discovered. Debian has a vast support community, so if you have any questions or problems with the OS or with some of the 30,000+ packages it features, you can easily contact the developers right away through electronic mail using special mailing lists and receive a response in 15-20 minutes. The Debian community supplies the top level of support possible, because all of your questions will be handled by the very same people who built Debian in the first place, so they have a detailed knowledge of how their system operates. Since the Operating System is 100% free to use and distribute, no license charges will be added to your hosting fees and you'll be able to change the code files and any additional software that you install with no restrictions, in order to optimize the software environment for your sites. In addition, Debian performs very well on any kind of hardware, as it is light and effective and does not require a lot of memory.