https://www.theregister.co.uk/2018/04/25/microsoft_windows_10_lean/

Pics Microsoft's Windows 10 Insider Preview Build 17650 (Redstone 5), released last week to through the Windows Insider program, includes a stripped-down version of the operating system called Windows 10 Lean.

Redstone 5 is the Windows update that intended to follow the impending Windows 10 Spring Creators Update, recently redesignated the Windows 10 April 2018 Update, which is expected any day now.