Starting today, people who reserved their upgrade to Windows 10 will be notified in waves. If you haven't yet reserved your upgrade, make sure your machine is up-to-date through Windows Update and you'll see a Windows 10 icon on the taskbar next to the notification area.
You may not see the icon straight away, but once it's there, give it a click and you'll be able choose to upgade immediately or at a time that suits you.
Notable inclusions in the new OS include a return for the Start menu (with built-in live tiles), new Universal apps that run on the desktop (and work across mobile, PC and even Xbox One) and four-way window snapping. There's also a new Action Centre to house notifications and more. Check our our Windows 10 features guide for more.
Windows 10 is designed to be cross-platform.and will not only run on PCs but on mobile, too, as well as small tablets that also run the mobile-centric ARM microarchitecture. The name choice was apparently selected as the OS has undergone a huge jump from Windows 8.
From the beginning of August, volume licence holders can grab Windows 10 Enterprise and Windows 10 Education.
Here's all our great Windows 10 coverage so far: