Microsoft's much-anticipated Windows 10 operating system will be available from July 29,the company reported.
Microsoft customers running Windows 7 or 8.1 can upgrade to the new system from free from the end of July, across 190 countries.
Users have one year to take advantage of the free upgrade, and once upgraded to Windows 10 Microsoft will continue to update it throughout the lifetime of the device.
Keen fans can reserve an upgrade through clicking an icon in their system tray in the bottom right hand corner of the screen.