The sleek new Surface Laptop comes with it, and so do $300 two-in-one tablet PCs for education and business. But exactly what is Windows 10 S, and how is it different from other versions of Windows 10?

The “S” in Windows 10 S doesn’t stand for anything, although Microsoft throws around words such as safe, secure, streamlined, superior performance, simple and student to explain it. Standardized and super locked down might be closer to the mark. This is a full version of Windows with some limitations, one that’s designed to start up quickly, have long battery life, and keep working properly month after month after month, without resets or support calls.

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