Windows 10 'Lean' is a smaller edition of Windows 10 for devices with 16GB of storage

[Windows Central]

Windows 10 Lean is Windows 10 on a diet. Featuring a much smaller footprint, Windows 10 Lean is designed for devices with 16GB of storage and ensures those devices can remain up to date.
Microsoft is working on a new edition of Windows 10 that Microsoft internally calls 'Windows 10 Lean' that, once installed, is a whole 2GB's smaller in size compared to a normal edition of Windows 10 like Windows 10 Home or Windows 10 Pro. This SKU was first spotted on Twitter thanks to its inclusion in the latest Redstone 5 preview build, but with no official announcement from Microsoft detailing what this new edition of Windows 10 is for, I decided to do some digging.

Full story from the WindowsCentral blog...