At its current pace, Snow Leopard will fall under the 10% mark by November, and below 5% by March 2015. But users may pick up that pace even more if Apple has its way. OS X Yosemite, the upgrade scheduled to ship this fall, includes some flashy new features, "Handoff" in particular, that require a newer Mac. Only machines that were launched two or more years after Snow Leopard will support the start-a-task-on-one-device-resume-on-another Handoff.
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