The 'Start' menu is now centre-aligned and available in a dark mode
The new software will let Android apps run on the Windows desktop.
Product manager Panos Panay promised smaller, faster security updates – a common complaint for Windows users – and said they would happen in the background.
Windows 11 will also let users configure multiple desktops for work, home, and gaming, like on a Mac.
Microsoft says there are currently about 1.3 billion devices running Windows 10.
An early preview version of the new system will be released for app developers next week.
Windows 11 will be available as a free update to existing Windows 10 users – although some devices will not have the right specifications. These include a minimum of 64 gigabytes of storage and 4 gigabytes of RAM.
One cosmetic change is putting the “Start” button at the bottom-centre of the screen rather than left-hand side.