Windows 10 bumps version number from 6.4 to 10.0 (update)

Windows 10 kernel version 10

Although Microsoft released the last version of Windows 10 for the year, it doesn’t mean that the company will stop working. New leaked screenshots reveals that Windows 10 build 9888 is making its way around a closed channel and shows the company bumping the kernel version number to 10.0.

Since Windows Vista, the kernel version of the operating system has been in the range, Windows 7 was introduced with the kernel, while Windows 8 received the and Windows 8.1 was bumped to the version range.

Today Microsoft bumping the kernel version number of Windows 10 to is a major change. The company has been working to make one Windows that works across all form factor devices sharing the same user experience and using a single core, and changing the kernel version shows that there is a huge amount of changes in the operating system.

SEE ALSO: Windows 10 Consumer Preview: features to expect in 2015

The leaked screenshots clearly show that the current version of Windows 10 is 10.0.9888 and it’s a big jump from the latest Technical Preview, which shipped with the 6.4.9879 version.


On each version of Windows, Microsoft has made major improvements to the kernel, but since Windows Vista, one of the reasons to keep the same major version number was always related to software compatibility. As such, it will be interesting to see if moving to version 10 in the kernel will bring any issues with older software.

Update: Microsoft confirms the change of the kernel version from 6.4 to 10.0 on an Internet Explorer support web page, which details modifications in the user-agent string for the software:

Developers preparing for Windows 10 should note that the Windows NT value in the UA string will change from 6.4 to 10.0 with the new release. If you have code that depends on the version number, we advise that you update to allow for the new value.

Source ITHome, Microsoft

About the author

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 15 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 21 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and Email him at [email protected].