- Making a call with an iPad 13 hours ago
- Upgrading to 10.7 and above, don't forget Rosetta! 6 days ago
- Upgrading to Sierra 6 days ago
Mac OS Sierra 10.12 was released on September 20, 2016.
A few Macs which came with Mac OS X 10.6 Snow Leopard can install Sierra. 10.6.1 shipped new with the MacBook Late 2009 and the iMac Late 2009, 10.6.3 shipped new with MacBook Pro Mid 2010, and 10.6.4 shipped new with the MacBook Air Late 2010, Mac Mini mid 2010, and the Mac Pro Mid 2010. Those that shipped new with 10.6.3 or later can only use their prebundled 10.6 installer disc, which may be available through AppleCare, and not the retail store 10.6.3 installer to install 10.6. System requirements for Sierra require the App Store of Mac OS X 10.7.5 to install Sierra.
So once you have determined if your Mac can install Sierra, be sure to read the compatibility guidelines before installing 10.7 or later before installing 10.7, and then 10.7.5 to make the update to Sierra.
Some older Macs that came with 10.4 and 10.5 can install up to 10.11, but not Sierra. Unfortunately 10.8 is the most recent operating system currently available for those Macs.
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