As #MARCHintosh comes to a close, I wanted to start an early celebration of #macOS (previously OS X, Mac OS X) 25th birthday. Although it’s technically 26 years old if you include the public unveiling and the public beta #Kodiak. macOS has come a long way since it came to market. Comparing the Cheetah and Tahoe, they are radically different operating systems but remain strikingly similar in many ways. You could sit down a user from opposite eras and they would be able to figure it out. #Apple