Speaking at the company’s Ignite conference this week, developer evangelist Jerry Nixon said: "Right now we’re releasing Windows 10, and because Windows 10 is the last version of Windows, we’re all still working on Windows 10."

Windows 10, an operating system that promises to banish all of the things that people hated about Windows 8, is a smart user interface that will automatically change based on what the user is doing. So, if the device is being used like a desktop computer -- keyboard and mouse -- it has the classic Windows feel, but lay a finger on the touch screen or, if it's a 2-in-1 device, remove the display from the keyboard, and everything instantly switches into a touchscreen input mode.

Windows 10 is also going to work across the whole ecosystem of Microsoft devices.

Microsoft has started also rolling out second build (10051) of the Windows 10 technical preview for phones which come with Project Spartan built within the operating system.

The new version is supporting almost all lumia phones except Lumia 640XL and Lumia 930 due to issues with the screen-scaling.

The build also features the IE11 to open sites that are not designed on the HTML 5 format. The browser was built by Microsoft in order to do away with the negative image of the IE earned in the last few years.

Microsoft has also included a new Outlook Mail and Outlook Calendar app that connected together. The mail application comes with various gesture features that make the interface of the email tool better and more responsive.

It has also improved the functionality of the device. The messaging window comes with call button for instant calling options.