Windows 10 is a free upgrade for devices that use Windows 7 and 8.1 machines and will be made available for new PCs and tablets.
Microsoft made a bad move with the Windows 8.x family and claims it has listened to over five million customers to introduce a set of features people might like.
Windows 10 is software as a service (SaaS) and will push upgrades to your machine, rather like Apple does with its OSX operating system.
It will be available on PCs, tablets, phones, Raspberry Pi and the Xbox One, but as we reported yesterday, it wants to embed the OS in all sorts of devices as it makes a play for the internet of things market.
The features Microsoft wants to highlight are Cortana, a Siri like digital assistant, and Xbox integration.
It will be making an enterprise version available towards the end of this year.