Developers use it to test software compatibility across every historical iteration of Windows 10.

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Released in July 2015, Windows 10 version 1507 (build 10240) marked a new era for Microsoft, moving away from the traditional "release-to-manufacturing" (RTM) model. The name "1507" is a retroactive label, indicating a release in July 2015 (YYMM) to fit a new versioning scheme.

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