It's the biggest design overhaul since the launch of Mac OS X. But it's what's behind that veneer that makes MacOS Big Sur such a big deal. Apple has announced that it's transitioning the Mac to Apple-made silicon. Promising performance and power consumption gains over existing Intel-based hardware, Apple will ship its first in-house systems by the end of this year. Apps like Microsoft Office and Adobe Photoshop have already been ported over, and a new version of Rosetta translates older Intel code so it runs seamlessly, just as the prior version did for PowerPC code running on Intel. Since the same basic silicon will power the entire lineup, the new Macs will be able to run iOS and iPad apps natively, as well. The entire transition is expected to take two years, with both Apple- and Intel-powered Macs still in the immediate pipeline.