Does it worth to upgrade?
MacBook Air OS X Mountain Lion, Autumn 2012
Intel Core i7, 2GHz / 8GB 1600 MHz DDR3 / Intel HD Graphics 4000 512MB
Last update ... long time ago OSX10.8.5 (12F2560)
My Macbook Air still functions brilliantly.
Concerns about vulnerability and hacks, if no upgrades.
Do I need to upgrade to Sierra at all?
MacBook Air, OS X Mountain Lion (10.8.4)