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Revealedphone version of Windows 10 software software for first time Will run on phones, tablets and even the firm's Xbox One console Xbox One console gamers can play against Windows 10 users, and stream console games to Windows 10 PCs and phones at home Will include Cortana personal assistant to take on Siri, allowing users to talk to their computer by saying 'Hey, Cortana' New spartan app will replace internet Explorer Single app store will hold desktop, phone and tablet apps Will launch in fall 2015 - despite initial claims of an earlier release

By Mark Prigg For Dailymail.com

Published: 17:37 EST, 21 January 2015 | Updated: 20:00 EST, 21 January 2015

Microsoft has revealed its new Windows 10 software will be free for existing Windows users.

The software, set to launch later this year, will also run on everything from mobile phones to the firm's Xbox One games console - and for desktop users, will see the return of the start menu.

It will come with Microsoft's Cortana digital assistant, and Spartan, a new web browser to replace internet Explorer, the firm said.

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Joey Belfiore of Microsoft showing off the firms new Windows 10 software running on a mobile phone

Windows 10 will include a new Xbox app to allow users to easily share with friends, and is extremely similar to the firm's Xbox One console system.

New operating system will run on the 'broadest types of devices ever'.

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Windows 10 will be FREE: Microsoft reveals software will come with Xbox app for games and new Cortana smart assistant ...