Microsoft will not release the Windows 10X operating system as earlier speculated. The new information became apparent in a short passage hosted on the official blog post of the company. 

Microsoft had been working on Windows 10X for some time, it would become a light version of Windows 10. In a blog post, John Cable, Microsoft's vice president of the Program Management division, states that the company has stopped developing Windows 10X. Microsoft mentions it is to integrate the features of Windows 10X into new versions of Windows 10:

Following a year-long exploration and engaging in conversations with customers, we realized that the technology of Windows 10X could be useful in more ways and serve more customers than we originally imagined. We concluded that the 10X technology shouldn’t just be confined to a subset of customers.

Instead of bringing a product called Windows 10X to market in 2021 like we originally intended, we are leveraging learnings from our journey thus far and accelerating the integration of key foundational 10X technology into other parts of Windows and products at the company. In fact, some of this is already reflected in the core of Windows in Windows Insider preview builds, for example the new app container technology we’re integrating into products like Microsoft Defender Application Guard, an enhanced Voice Typing experience, and a modernized touch keyboard with optimized key sizing, sounds, colors and animations. Our teams continue to invest in areas where the 10X technology will help meet our customer needs as well as evaluate technology experiences both in software and hardware that will be useful to our customers in the future.

Microsoft: Windows 10X Will not Be Released