

Mac OS X 10.2 (Jaguar) or later require the correct firmware be installed. There are some Macs that came with 10.4 that can install up to 10.11. Mac OS X Sierra, which was released Septemis the first Mac OS X not compatible with any Macs running TIger. Mac OS X server questions more often are best answered by participants of the Server forums, as the limitations of Mac OS X Server can frequently differ. Note this tip, and the related tips from Mac OS X 10.3 to 10.11 refer to Mac OS X Client. When determining which operating system you meet the requirements for, see this tip on Mac model and age: On PowerPC Macs 10.4.11 is the end of Classic's compatibility), 10.5 Leopard, 10.6 Snow Leopard, 10.7 Lion, 10.8 Mountain Lion and 10.9 Mavericks, 10.10 Yosemite, 10.11 El Capitan. Tips on 10.2 Jaguar, 10.3 Panther, 10.4 Tiger (10.4.4 is the beginning for some Intel Macs.
