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Build 29599.1000

Build 29599.1000: Windows Insider Experimental Channel, May 2026. Task Manager CPU speed display and Microsoft account sign-in fix

In short

Build 29599.1000 is for Insiders in the Canary 29500 Series Channel, though some may not yet have transitioned to Experimental (Future Platforms). It fixes a misleading internet message during Microsoft account sign-in and improves CPU speed display for virtual machines.

Does it affect you? Applies to: Insiders in the Canary 29500 Series Channel. The notes use the Experimental (Future Platforms) channel name, but some Insiders may not yet have transitioned. AMD devices supporting System Guard are not offered this build.

Build
29599.1000

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 2 changes

Platform

Gradual rollout

For: Insiders in the Canary 29500 Series Channel

  • Windows moves to a new active development build with platform changes.1

Task Manager

Gradual rollout
  • After resuming from hibernate, the Performance page shows CPU speeds for virtual machines without unexpectedly high numbers.2
    Applies to the Performance page of Task Manager for VMs.

Fix 1 change

Microsoft account sign-in

Gradual rollout

For: Some Insiders in the Canary 29500 Series Channel

  • Some Insiders no longer see a false message saying they are not connected to the internet when signing into a Microsoft account in certain apps.3

Technical details

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

Data sheet

Released
2026-05-29
Type
Windows Insider build
VersionBuildChannel
— 29599.1000 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 platform changes in moving to a new active development build. learn.microsoft.com
  2. 2. This update improves CPU speed display on the Performance page of Task Manager for VMs, so it doesn’t show higher than unexpected numbers after resuming from hibernate. learn.microsoft.com
  3. 3. erroneous message saying they weren’t connected to internet (when they actually were) when signing into their Microsoft account in certain apps recently. 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 5/5, clarity 4/5, 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