Check out Trivia Tuesday's awesome infographic pedigree of Microsoft operating systems, from MS-DOS and OS/2 all the way up to Windows 8, and everything in between. Yes, even Zune.
Windows 10 review: Microsoft goes back to the future
Windows 10 ISOs now available to download
Poll: Is Windows 10 ready for its launch?
Hands-on: Phone Continuum in Windows 10 Mobile
windows 10 phone continuum
Hands-on: Windows Hello biometric log-in