From WinAero
Windows 10 Lean is a new cut down edition of Windows 10 RS5. Microsoft
is working on a new cut down version of Windows 10 for the “Redstone
5” feature update of Windows 10. It is called “Windows 10 Lean”,
starts in Windows 10 S Mode, and currently identifies itself as
“Windows 10 CloudE”.This new cut down Windows 10 version doesn’t include many basic
things. It comes without wallpapers, CD/DVD drivers, and apps like
Registry Editor or MMC. Its image is 2 GB smaller than Windows 10 Pro.As of this writing, the user can just copy the missing apps, e.g.
regedit.exe, from another Windows 10 instance, and they will work
without issues. The OS has no software restrictions for first-party
apps.The new edition has started shipping with the release of Windows 10
Build 17650 (RS5), which was recently released to Windows Insiders. It
is not clear what Microsoft plans regarding this new edition of
Windows 10. Currently, an advantage is that it shrinks the
installation size by 2GB in comparison to regular Windows 10 versions.
