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Windows 10 1507 (codenamed "Threshold 1") was the initial public version of Windows 10 released in July 2015. Unlike subsequent updates (such as 22H2) which added heavy background processes, Cortana, and automated cloud systems, Version 1507 was lightweight.

She nodded, handed the laptop back, and he watched the screen settle into the quiet background. Outside the window the city lights flickered like notifications; inside, the system breathed steady and small, a private little island of control in an ocean that never learned to stop asking.

Often excised to reduce background processes.

Here’s a concise review of — typically a custom, modified ISO made by third-party enthusiasts, not Microsoft.