2013, with the introduction of the cylindrical Mac Pro. However, the OS X Server software package can be purchased from the Mac App Store. The redesigned Mac Pro released on December 10, 2019 has a rack-mount version, available in the same configurations as the standard Mac Pro for a $500 premium. The Mac Pro Rack comes with mounting rails to mount it in a server rack, and fits in a 5 Rack Unit (or "U") space. See also Dell Precision Fujitsu Celsius HP Z Lenovo ThinkStation Explanatory notes References External links – official site Computer workstations Computer-related introductions in 2006 Macintosh computers by product line Macintosh towers X86 Macintosh computers