Big Sur is officially macOS 11.0 as Apple finally leaves OS X behind
The Verge
JUNE 22, 2020
OS X also spanned generations of Apple hardware, from the early PowerPC days of the iMac and MacBook, to the Intel shift of 2005, to newer devices like the ultra-thin MacBook Air or the astronomically priced Mac Pro. OS X defined the Mac for generations of hardware and software. End of an era. The shift to macOS 11.0
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