A free upgrade to Windows 10 will be offered to Windows 7, 8 and 8.1 users who make the jump in the first 12 months.

“Windows 10 marks the beginning of the more personal computing era in the mobile-first, cloud-first world,” said Satya Nadella, CEO of Microsoft. “Our ambition is for the 1.5 billion people who are using Windows today to fall in love with Windows 10 and for billions more to decide to make Windows home.”

Windows 10 promises a host of new functionality and features, notably:

Cortana comes to PC and tablet: The Cortana personal digital assistant, which debuted on Windows Phone last year, will now also be available on Windows 10 PCs and tablets to help people get things done. Cortana is a personal helper who learns an individual’s preferences to provide relevant recommendations, fast access to information and important reminders, bringing what matters most to their attention. Interaction is natural and easy via talking or typing, with advanced features to control Cortana for more trustworthiness and transparency.

New browser Project Spartan: Windows 10 will feature the new Microsoft browser, code-named Project Spartan, which was built with interoperability in mind. With key features built-in natively to the browser, it will enable greater reliability and better discoverability. Some of the most advanced features in the browser include the ability to annotate whether by keyboard or pen directly on the webpage and easily share with friends; a reading view that is distraction-free, displaying the article in a simplified layout for a great reading experience for Web articles online and offline; and the integration of Cortana for finding and doing things online faster. All of this is offered with a new look and feel built just for Windows 10.

Xbox Live and the new Xbox app bring new gaming experiences to Windows 10: Xbox on Windows 10 lets gamers and developers access the best of the expansive Xbox Live gaming network on both Windows 10 PCs and Xbox One. Players can capture, edit and share their greatest gaming moments with Game DVR, and play new games with friends across devices, connecting millions of gamers around the world. Games developed for the new DirectX 12 application programming interface in Windows 10 will see improvements in speed, efficiency and graphics capability. Players will also be able to play games on their PC, streamed directly from their Xbox One consoles to their Windows 10 tablets or PCs, within their home.

Continuum mode: On 2-in-1 devices, Windows 10 will move easily between keyboard and mouse and touch and tablet as it detects the transition and conveniently switches to the new mode.

New universal apps: Windows 10 will offer new experience applications, consistent across the device continuum, for Photos, Videos, Music, Maps, People & Messaging and Mail & Calendar. These built-in apps have an updated design that looks and feels the same from app to app and device to device. Content is stored and synced through OneDrive, enabling people to start something on one device and continue it on another.

Source: Microsoft