Meet Windows 10, a Throwback With Upgrades in Software and Security - The New York Times

No Windows 10 for me, despite today being the big launch day; I'm blocked by a Parallels driver incompatibility on my Mac, and my last remaining Windows PC, running Windows 8.1 with all updates, is inexplicably unable to "reserve" Windows 10

"Combine the early bugs with the spottiness of Cortana and the fact that third-party app developers are still updating their Windows apps for Windows 10, and the operating system still has a little ways to go before it becomes a solid all-around upgrade. But the improvements to security, along with the familiar user interface, should be reasons to grab this upgrade sooner than later (especially if you’re on Windows 7 and lacking up-to-date security tools). The upgrade will be free for up to a year — after that, Microsoft may begin charging for it."

Meet Windows 10, a Throwback With Upgrades in Software and Security - The New York Times