You’ll be able to upgrade to Windows 10 for free, even if you’re currently using a pirated version of Windows 7 or Windows 8.
Windows 10 Technical Preview Build 10041 Launched
The latest Windows 10 technical preview build brings Cortana to more territories, while introducing several improvements to system apps.
Windows 10 Launching This Summer, Microsoft Details Chinese Partnerships
Windows 10 will be available as a free upgrade, and will be launching this summer in 190 countries.