Windows 10 version history - Wikipedia
https://en.wikipedia.org/wiki/Windows_10_version_historyMainstream builds of Windows 10 are labeled "YYMM", with YY representing the two-digit year and MM representing the month of planned release (for example, version 1507 refers to builds which initially released in July 2015). Starting with version 20H2, Windows 10 release nomenclature changed from the year and month pattern to a year and half-year pattern (YYH1, YYH2). The second stable build of Windows 10 is version 1511 (build number 10586), known as the Nov…