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

Build 28020.2149

Build 28020.2149: Windows Insider Experimental Channel, May 2026. Dev Drive size controls and improved Greek and Cyrillic text

In short

Build 28020.2149 for the Experimental Channel gradually improves desktop reliability, Dev Drive sizing, and Greek and Cyrillic text rendering. The notes also mark a Reset this PC issue as fixed.

Does it affect you? Applies to: Devices enrolled in the Experimental (26H1) Channel, formerly the Canary 28000 series Channel.

Build
28020.2149

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 Channel

  • Closing the input switcher and switching between multiple desktops become more reliable.1
    Improves explorer.exe reliability in these situations.

Storage

Gradual rollout

For: Insiders in the Experimental Channel

  • When creating a Dev Drive or changing volume sizes, you can specify the size in GB instead of only MB.2
    The size option is available in the Dev Drive creation dialog and under Settings > System > Storage when changing volume sizes.

Fonts

Gradual rollout

For: Insiders in the Experimental Channel

  • Greek and Cyrillic text in Times New Roman has more accurate placement of combining marks, improving readability.3
    Updates the Times New Roman font family to address combining diacritical mark positioning across Greek and Cyrillic scripts.

Fix 1 change

Reset PC

For: Insiders in the Experimental Channel

  • The notes mark as fixed a problem that could leave Reset this PC stuck. If a reset gets stuck, choose cloud download instead of local.4

Technical details

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

Data sheet

Released
2026-05-22
Type
Windows Insider build
VersionBuildChannel
— 28020.2149 Experimental Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. Improved reliability of explorer.exe when closing the input switcher, and when switching between multiple desktops. learn.microsoft.com
  2. 2. We’ve updated the dialog when creating a Dev Drive to now support specifying the size in GB instead of only MB. This has also been added when changing the size of volumes under Settings > System > Storage. learn.microsoft.com
  3. 3. The Times New Roman font family is updated to improve the rendering of combining diacritical marks across Greek and Cyrillic scripts. learn.microsoft.com
  4. 4. [Fixed] Resetting your PC may get stuck when using "Reset this PC." To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local. learn.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 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 5/5, 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