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Windows 11 Windows 11 Insider 26H1 Insider Preview, Experimental Channel
Windows Insider

Build 28120.3122

Build 28120.3122: Windows Insider Experimental Channel, September 2026. Small changes to the overall experience on PCs

In short

Brings general improvements and fixes to PCs in the Experimental Channel.

Does it affect you? Applies to: Windows Insiders running this build in the Experimental (26H1) Channel.

Build
28120.3122

This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.

What changes

Improvement 1 change

Overall experience

Gradual rollout

For: Insiders running this build

  • A small set of general improvements and fixes improves the overall experience on your PC.1

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-09-25
Type
Windows Insider build
VersionBuildChannel
— 28120.3122 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. This update includes a small set of general improvements and fixes that improve the overall experience for Insiders running this build on their PCs. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake