The software will feature a number of Windows 10 customizations for the China market, such as its Cortana personal assistant in Mandarin.
The company, which first showed off Windows 10 in September (2014) and gave a fuller preview in January, had said the new software would go on sale sometime this year.
Windows 10 features a new web browser that will replace Internet Explorer for most consumers.
In January, Microsoft also announced a version of the software called Windows Holographic, and a headset with glasses called the HoloLens that will let users see holograms while tracking a user’s voice, motion and surroundings.
The glasses will be available in the same time frame as Windows 10, the company said at the time.
Microsoft also attempted a radical overhaul of Windows with the previous version, Windows 8. The company wound up with unhappy corporate customers, who found the program’s new design difficult to use.
With Windows 10, Microsoft is trying to merge design elements from Windows 7 with some of version 8’s changes, and is once again trying to appeal to tablet and mobile-phone customers, an area where Windows has won minimal market share.