Windows 10 (21H1) Build Tracker
This ITPro Today Build Tracker follows the public development cycle of the Windows 10 (21H1) feature update for Windows 10 in the Dev Channel. It is expected to be generally available sometime in the first half of 2021.
![Dev Channel Build Tracker for Windows 10 (21H1) Dev Channel Build Tracker for Windows 10 (21H1)](https://eu-images.contentstack.com/v3/assets/blt07f68461ccd75245/blt7b7d77daa05d4929/6616aab7ee6335176b7d198b/dev-channel-build-tracker-hero-image.jpg?width=700&auto=webp&quality=80&disable=upscale)
Release Date: December 14, 2020
Days Since Last #DevChannel Release: 04 Days (Build 20277)
Release Notes: Announcing Windows 10 Insider Preview Build 20279
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: December 10, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20270)
Release Notes: Announcing Windows 10 Insider Preview Build 20277
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: December 3, 2020
Days Since Last #DevChannel Release: 13 Days (Build 20262.1010)
Release Notes: Announcing Windows 10 Insider Preview Build 20270
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: November 20, 2020
Days Since Last #DevChannel Release: 02 Days (Build 20262)
Release Notes: Announcing Windows 10 Insider Preview Build 20262.1010
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release). Servicing update - no new features.
Release Date: November 18, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20257)
Release Notes: Announcing Windows 10 Insider Preview Build 20262
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: November 11, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20251)
Release Notes: Announcing Windows 10 Insider Preview Build 20257
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: November, 4, 2020
Days Since Last #DevChannel Release: 06 Days (Build 20246.1)
Release Notes: Announcing Windows 10 Insider Preview Build 20251
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: October 29, 2020
Days Since Last #DevChannel Release: 06 Days (Build 20241.1005)
Release Notes: Announcing Windows 10 Insider Preview Build 20246
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Release from Iron Branch (fe_release).
Release Date: October 23, 2020
Days Since Last #DevChannel Release: 02 Days (Build 20241)
Release Notes: Announcing Windows 10 Insider Preview Build 20241.1005
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Cumulative Update to test servicing pipeline for #DevChannel. No new features or changes.
Release Date: October 21, 2020
Days Since Last #DevChannel Release: 05 Days (Build 20236.1005)
Release Notes: Announcing Windows 10 Insider Preview Build 20241
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: N/A
Release Date: October 16, 2020
Days Since Last #DevChannel Release: 02 Days (Build 20236)
Release Notes: Announcing Windows 10 Insider Preview Build 20236.1005
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Cumulative Update to test servicing pipeline for #DevChannel. No new features or changes.
Release Date: October 14, 2020
Days Since Last #DevChannel Release: 02 Days (Build 20231.1005)
Release Notes: Announcing Windows 10 Insider Preview Build 20236
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: October 12, 2020
Days Since Last #DevChannel Release: 05 Days (Build 20231)
Release Notes: Announcing Windows 10 Insider Preview Build 20231.1005
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Note: Cumulative Update to test servicing pipeline for #DevChannel. No new features or changes.
Release Date: October 7, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20226)
Release Notes: Announcing Windows 10 Insider Preview Build 20231
ISO Released: October 7, 2020
Days Since Last #DevChannel ISO Release: 77 Days (20175)
Release Date: September 30, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20221)
Release Notes: Announcing Windows 10 Insider Preview Build 20226
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: September 23, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20215)
Release Notes: Announcing Windows 10 Insider Preview Build 20221
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: September 16, 2020
Days Since Last #DevChannel Release: 06 Days (Build 20211)
Release Notes: Announcing Windows 10 Insider Preview Build 20215
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: September 10, 2020
Days Since Last #DevChannel Release: 08 Days (Build 20206)
Release Notes: Announcing Windows 10 Insider Preview Build 20211
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: September 2, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20201)
Release Notes: Announcing Windows 10 Insider Preview Build 20206
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: August 26, 2020
Days Since Last #DevChannel Release: 05 Days (Build 20197)
Release Notes: Announcing Windows 10 Insider Preview Build 20201
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: August 21, 2020
Days Since Last #DevChannel Release: 09 Days (Build 20190)
Release Notes: Announcing Windows 10 Insider Preview Build 20197
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: August 12, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20185)
Release Notes: Announcing Windows 10 Insider Preview Build 20190
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: August 5, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20180)
Release Notes: Announcing Windows 10 Insider Preview Build 20185
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: July 29, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20175)
Release Notes: Announcing Windows 10 Insider Preview Build 20180
ISO Released: N/A
Days Since Last #DevChannel ISO Release: N/A
Release Date: July 22, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20170)
Release Notes: Announcing Windows 10 Insider Preview Build 20175
ISO Released: July 22, 2020
Days Since Last #DevChannel ISO Release: 35 Days (20150)
Release Date: July 15, 2020
Days Since Last #DevChannel Release: 14 Days (Build 20161)
Release Notes: Announcing Windows 10 Insider Preview Build 20170
Release Date: July 1, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20152)
Release Notes: Announcing Windows 10 Insider Preview Build 20161
Release Date: June 24, 2020
Days Since Last #DevChannel Release: 07 Days (Build 20150)
Release Notes: Announcing Windows 10 Insider Preview Build 20152
Release Date: June 17, 2020
Days Since Last #DevChannel Release: N/A - First release for 21H1
Release Notes: Announcing Windows 10 Insider Preview Build 20150
ISO Released: June 17, 2020
Days Since Last #DevChannel ISO Release: N/A - First Release for 21H1
Release Date: June 17, 2020
Days Since Last #DevChannel Release: N/A - First release for 21H1
Release Notes: Announcing Windows 10 Insider Preview Build 20150
ISO Released: June 17, 2020
Days Since Last #DevChannel ISO Release: N/A - First Release for 21H1
The IT Pro Guide to Microsoft Insider Programs
Microsoft develops future updates for Windows 10 across three development channels (Dev, Beta, and Release Preview Channel).
This build tracker will provide enterprise and business customers a chronological reference list of all pre-release builds available in the Dev Channel for Windows 10 (21H1).
According to Microsoft, the key considerations for Dev Channel builds are:
Targets highly technical users who can deal with bugs and disruptions to their workflow.
Provides advanced access to the earliest builds in the development cycle for testing the latest features, enhancements, and compatibility.
Expect some rough edges and instability during testing. These builds should not be installed on production devices.
Visit the Windows Insider for Business page for more details and enrollment information.
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