Windows 11 KB5124006 release preview build lands with long shell improvement feature list
Microsoft issued the Windows 11 KB5124006 release preview build, featuring a long list of shell improvements. Concurrently, the company rolled out its monthly patch release, which Extremetech and Krebs on Security report as the biggest update ever by plugging a record number of security flaws. Extremetech specifies that the update patches 974 security flaws, while Krebs on Security reports that Microsoft plugged nearly 1,000 security holes. Ars Technica also noted the massive scale of this month's patch release. Users testing the preview build gain access to numerous interface adjustments alongside the heavy wave of security fixes.
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- ✓ Microsoft released Windows 11 KB5124006 to the release preview build with a long list of shell improvements.
- ✓ Microsoft patched a record 974 security flaws in what is described as its biggest update ever.
What changed
Microsoft released Windows 11 KB5124006 in the release preview channel alongside a record-breaking security update.
Live updates
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Windows 11 Release Preview Build KB5124006 Arrives With Shell Updates
Microsoft issued the Windows 11 KB5124006 release preview build, featuring a long list of shell improvements. Concurrently, the company rolled out its monthly patch release, which Extremetech and Krebs on Security report as the biggest update ever by plugging a record number of security flaws. Extremetech specifies that the update patches 974 security flaws, while Krebs on Security reports that Microsoft plugged nearly 1,000 security holes. Ars Technica also noted the massive scale of this month's patch release. Users testing the preview build gain access to numerous interface adjustments alongside the heavy wave of security fixes.
Why it matters
Monthly security updates are standard procedure for Microsoft, but the scale of the latest patch release marks an unprecedented volume of fixes. At the same time, Microsoft continues to refine the Windows 11 user experience through preview builds that target long-standing shell behaviors. These simultaneous updates affect both core operating system security and day-to-day user interactions across millions of devices.
What is confirmed
- Microsoft released Windows 11 KB5124006 to the release preview build with a long list of shell improvements.
- Microsoft patched a record 974 security flaws in what is described as its biggest update ever.
What to watch next
- Monitoring user feedback on the stability of Windows 11 KB5124006 shell improvements.
- Tracking the general rollout of the record-breaking security patch to all Windows 11 users.
confidence 100%Sources used for this update (6)
- arstechnica.com — Why this month’s Microsoft patch release is a doozy
- Krebs on Security — Microsoft Plugs Nearly 1,000 Security Holes
- extremetech.com — Microsoft Patches a Record 974 Security Flaws in Biggest Update Ever
- PCWorld — 5 years later, I can finally use Windows 11 the way I want
- Neowin — Windows 11 KB5124006 release preview build lands with long shell improvement feature list
- www.enr.com — ENR 2026 Top 400 Contractors
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