Big Sur is officially macOS 11.0 as Apple finally leaves OS X behind
The Verge
JUNE 22, 2020
The original version of Mac OS X (which Apple rebranded to macOS to better match its iOS, watchOS, and tvOS software brands with the release of macOS Sierra back in 2016) was released as a public beta for $29.99 OS X defined the Mac for generations of hardware and software. The shift to macOS 11.0
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