The evolution of macOS (and Mac OS X)

Apple introduced OS X Mountain Lion at WWDC 2012, and from then onward dropped the “Mac” prefix from all references of OS X on its website. iCloud synced mail, calendars, contacts, reminders, documents, notes and more between Macs, iPads, iPhones and iPod touches. Apps from iOS devices were also brought over: Reminders, Notes and Messages, which brought iMessage to the Mac for the first time; Notification Center alerted users to new emails, messages, software updates or calendar alerts; Dictation converted words into text; and a new Sharing button allowed the sharing of photos, videos, files and links with Mail, Messages and AirDrop.

OS X 10.8 integrated Facebook and Twitter so users could set up and manage their accounts right in System Preferences. AirPlay Mirroring enabled easy sharing from a Mac to an Apple TV, and Game Center brought games from iOS to the Mac. Finally, Gatekeeper helped protect users from downloading and installing malicious software to their Macs by only permitting users to install apps from the Mac App Store and other identified developers. Users could download this update for a slimmer price at $19.99.