No server operating system satisfies more varied requirements or boasts a wider range of brilliant features. Start with the ZFS file system, which wins its own 2008 Technology of the Year award; add DTrace, the best OS analysis tool available; throw in Solaris Containers' native, built-in virtualization, a feature no other OS currently bundles; and top it off with the ability to run Red Hat Linux binaries. It's simply the most innovative version of a server operating system this decade.