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"Cobalt" is a development cycle of Windows 10. It is the last Windows 10 development cycle before Windows 11 was officially announced on 24 June 2021.

Its server counterpart is Windows Server Cobalt. It also replaces Windows 10 Iron and was replaced by Windows 11 Nickel and Windows 11.

Builds[]

Pre-Insider Preview[]

  • 21200
  • 21245.1000.rs_prerelease.201023-1355
  • 21246.1000.rs_prerelease.201024-2007
  • 21251
  • 21254.rs_xbox.201104-1320
  • 21257.0
  • 21262.1000
  • 21264.1000.rs_prerelease.201117-1315
  • 21268.1000.rs_prerelease.201123-1408
  • 21270.1000.rs_prerelease.201126-1100
  • 21274.1000.rs_prerelease.201202-1418
  • 21276

Insider Preview (rs_prerelease)[]

Insider Preview (co_release)[]

  • 21353.1.co_release.210401-1537
  • 21354.1.co_release.210402-1630
  • 21358.1.co_release.210408-1608
  • 21359.1.co_release.210409-1536
  • 21362
  • 21363.1.co_release.210415-1442
  • 21364.1.co_release.210416-1504
  • 21364.1000.co_release_svc_prod1.210417-1937
  • 21364.1011.co_release_svc_prod2.210421-0236
  • 21367.1000
  • 21369.1.co_release.210423-1650
  • 21370.1.co_release.210424-1611
  • 21375.1.co_release.210430-1912
  • 21376.1.co_release.210503-1432
  • 21381.1.co_release.210510-1415
  • 21381.1000.co_release_prs.210510-1427
  • 21382.1.co_release.210511-1416
  • 21382.1000.co_release_svc_prod1.210511-1436
  • 21386.1.co_release.210517-1400
  • 21387.1.co_release.210518-1436
  • 21387.co_release_fun.210518-1507
  • 21389.1.co_release.210520-1520
  • 21390.1.co_release.210521-1658
  • 21390.1000.co_release_svc_prod1.210524-1655
  • 21390.1010.co_release_svc_prod2.210524-1306
  • 21390.2025.co_release_svc_im.210527-1818

Localization (rs_loc)[]

  • 21325.1000
  • 21330.1000.rs_loc.21030?-????
  • 21332.1000.rs_loc.21030?-????
  • 21334.1000.rs_loc.21030?-????
  • 21336.1000.rs_loc.2103??-????
  • 21337.1000.rs_loc.21031?-????
  • 21338.1000.rs_loc.21031?-????
  • 21339.1000.rs_loc.21031?-????
  • 21340.1000.rs_loc.21031?-????
  • 21341.1000.rs_loc.21031?-????
  • 21343.1000.rs_loc.21032?-????
  • 21344.1000.rs_loc.21032?-????
  • 21345.1000
  • 21346.1000
  • 21347.1001
  • 21349.1000
  • 21365.1000
  • 21369.1000
  • 21371.1000
  • 21372.1001
  • 21374.1000
  • 21375.1000
  • 21376.1000
  • 21377.1000
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