CIOs of mission-critical data centers that use UNIX solutions face tightening resources and an uncertain market. This white paper examines the strengths and weaknesses of the three major players in enterprise-level UNIX solutions: AIX from IBM, HP-UX from HP and Solaris from Oracle. HP and Oracle's offerings have an uncertain future in the marketplace, whereas IBM's recent improvements in its POWER7 system indicate a robust future for AIX. The paper outlines recent improvements in POWER7 including light path diagnostics, memory expansion and SSD drives to help data centers deliver faster, more efficient service at lower cost.