Microsoft has changed Windows As A Service and this was explained in a blog post by Michael Niehaus.
As we announced back in April, Microsoft is aligning our servicing models with twice-per-year feature update releases targeting March and September, and 18-month servicing timelines for each release. While the first fully-aligned release will occur later this year with the Windows 10 Fall Creators Update release and a corresponding Office 365 ProPlus release, we got a head start with the Windows 10 1703 release (a.k.a. Creators Update): It marks the first of our semi-annual releases, eac