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

Build 28120.2315

Build 28120.2315: Windows Insider Experimental Channel, June 2026. Caption style updates and more reliable HD Audio

In short

Improves caption style responsiveness and inbox HD Audio driver reliability.

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

Build
28120.2315

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

Improvements 3 changes

General

Gradual rollout

For: Insiders in the Experimental (26H1) Channel

  • A small number of minor bug fixes and improvements are included, though the notes do not describe them individually.1

Accessibility

Gradual rollout

For: Insiders in the Experimental (26H1) Channel

  • Captions redraw immediately when you change their style. If no caption is visible, a sample caption appears.2

Audio

Gradual rollout

For: Insiders in the Experimental (26H1) Channel

  • The inbox HD Audio driver is more reliable.3

Technical details

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

Data sheet

Released
2026-06-19
Type
Windows Insider build
VersionBuildChannel
— 28120.2315 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. This update includes a small number of minor bug fixes and improvements. learn.microsoft.com
  2. 2. This update improves caption style responsiveness by redrawing captions immediately for caption style changes. If no current caption is visible, a sample caption string is displayed. learn.microsoft.com
  3. 3. This update improves the reliability of the inbox HD Audio driver. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 quoted passages
  • 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 4/5, completeness 4/5. 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