Apple signaled that it will ship OS X Yosemite on Oct. 21; it has scheduled its third-quarter earnings call for the day before.

Although Apple has not yet officially revealed the launch date for Yosemite — which is also identified as OS X 10.10 — the earnings call on Monday, Oct. 20, is a clue that the upgrade will appear in the Mac App Store the next day.

In both 2011 and 2012, Apple used an earnings call to announce the availability of OS X Lion and Mountain Lion, respectively. In each of those years, the pertinent conference call with Wall Street analysts was for the second quarter, the one that ended in June, because Apple launched the upgrades the following month.

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