OS X 10.7 (Lion) was the first post-iPhone version of MacOS, released in late 2011. It was a bumpy release and it's not remembered fondly, but it introduced a

OS X 10.7 (Lion) was the first post-iPhone version of MacOS, released in late 2011. It was a bumpy release and it's not remembered fondly, but it introduced a number of fundamental features that modern iOS/Mac users depend on, like iCloud. The previous version from 2009, OS X 10.6, was essentially a maintenance/refinement release with few new features while the rest of Apple was heavily focused on launching the iPhone and the App Store. Many people consider 10.6 to be the strongest OS X release, but it feels positively retro by today's standards.