Microsoft released KB5089573 on May 26, 2026, an optional preview cumulative update for Windows 11 24H2 and 25H2 with roughly 30 improvements. The update adds Bluetooth LE Shared Audio for dual-headset listening, NPU monitoring columns in Task Manager, Multi-App Camera access, and performance optimizations that accelerate app launches and core shell experiences like Start menu, Search, and Action Center.
KB5089573 is the first update under Microsoft's K2 quality initiative targeting foundational performance. It also resolves the 0x800f0922 install error that blocked the May security update KB5089549 on devices with limited EFI partition space.
Key takeaways
- Builds 26100.8524 (24H2) and 26200.8524 (25H2). Optional, no security patches.
- Shared Audio lets two Bluetooth LE devices listen to the same PC audio simultaneously.
- Task Manager gains NPU and NPU Engine columns for AI workload monitoring.
- Multi-App Camera lets multiple apps access the webcam, with Group Policy control.
- Resolves the 0x800f0922 install error from KB5089549.
Affected
KB5089573 Brings Shared Audio and Faster Shell
Microsoft released KB5089573 on May 26, 2026, an optional preview for Windows 11 24H2 and 25H2 with roughly 30 changes. Builds update to 26100.8524 and 26200.8524.
Shared Audio lets two Bluetooth LE devices listen to the same PC audio. Task Manager adds NPU columns for AI workload monitoring. Multi-App Camera allows multiple apps to use the webcam at once.
First K2 Quality Update
This is the first update under Microsoft's K2 initiative targeting shell performance. App launches and Start, Search, Action Center are faster. Resolves the 0x800f0922 install error from KB5089549.
All Windows 11 24H2 and 25H2 Editions
All editions, x64 and ARM64. Optional, no security patches. No known issues reported by Microsoft.
Timeline
Impact & actions
Optional preview with roughly 30 improvements: new features (Shared Audio, NPU monitoring, Multi-App Camera) and shell performance gains. Resolves 0x800f0922 from KB5089549.
Recommended actions · Low urgency
- 1Install in test environments before June Patch Tuesday.
- 2Verify 0x800f0922 fix if EFI partition errors occurred.
- 3Review Secure Boot certificate status before June 2026.
Response
Vendor
Customer guidance
Install via Settings > Windows Update > Advanced options > Optional updates.
FAQ
What new features does KB5089573 add?
Shared Audio (two Bluetooth LE devices on one PC), Task Manager NPU columns for AI monitoring, Multi-App Camera for simultaneous webcam access, and custom user folder naming during Windows setup.
Does KB5089573 fix the 0x800f0922 error?
Yes. Per Microsoft's May 29 changelog, KB5089573 resolves the 0x800f0922 install error that blocked KB5089549 on devices with limited EFI partition space.
Is KB5089573 a security update?
No. Optional C release preview, no security patches. Fixes roll into June Patch Tuesday KB5094126.
Which Windows versions are supported?
Windows 11 24H2 and 25H2, all editions (Home, Pro, Enterprise, Education), x64 and ARM64. Builds 26100.8524 and 26200.8524.
Are there known issues?
Microsoft reports no known issues with KB5089573.
The bottom line
KB5089573 delivers roughly 30 improvements to Windows 11 24H2 and 25H2, headlined by Bluetooth LE Shared Audio, Task Manager NPU columns, Multi-App Camera, and faster shell performance under the K2 initiative.
What happens next
What to do
