Apple previews macOS Sierra to the public

Apple today released the first public preview of macOS Sierra, this year's upgrade to the operating system formerly known as OS X.
The preview arrived a week earlier than Computerworld's forecast; that prediction was based on the span between the developer unveiling and public beta of last year's OS X El Capitan.
This was the third year straight that Apple has made previews available to the general public. The Cupertino, Calif. company restored the beta program in 2014 with OS X Yosemite after