Microsoft released its June 2026 Patch Tuesday update for Windows 11 on 9 June, and it’s proving to be one of the most feature-packed monthly updates the operating system has seen in years. For UK SMEs running Windows 11 versions 24H2 or 25H2, this update—delivered as KB5094126—brings welcome performance improvements, important security fixes and some changes that require immediate attention.
However, the update has also introduced several confirmed issues affecting business applications, particularly those that integrate with Microsoft Office. If your team hasn’t installed this update yet, here’s what you need to know before you do.
Windows 11 Low Latency Profile: Faster Performance for Daily Tasks
One of the standout features is the Low Latency Profile, which triggers short CPU bursts when you open the Start menu, Search, Action Center or applications
. In practical terms, this means Windows 11 will feel noticeably snappier, especially on mid-range or older hardware.
For businesses still running older office PCs, this performance boost could extend their useful life by several months, delaying replacement costs.
Testing shows the difference is most visible on mid-range and older hardware
, which is exactly what many Kent SMEs are working with.
The improvement addresses a common frustration: the slight lag when clicking the Start menu or launching applications. By briefly spiking CPU activity for 1–2 seconds, the operating system responds faster without requiring expensive hardware upgrades.
Critical Secure Boot Certificate Updates
The June 2026 update delivers Secure Boot certificate updates as part of normal rollout, replacing certificates originally issued in 2011 with 2023 versions as the older ones expire in June 2026
. This is not optional—it’s a security requirement that affects nearly every Windows 11 PC.
Secure Boot is a security feature that ensures only trusted software runs when your PC boots up. Without updated certificates, your systems could face boot failures or security warnings.
Windows quality updates include additional device targeting data, with devices receiving new certificates only after demonstrating sufficient successful update signals
.
Most consumer and non-managed business devices received these certificates months ago, but if you manage your own IT infrastructure, you should verify that all systems have received the update. You can check this in Windows Security settings.
For businesses concerned about vulnerability exploitation, keeping these certificates current is essential to maintaining your security posture.
Multi-App Camera Support: A Welcome Change for Hybrid Working
Windows 11 previously had an annoying limitation where only one application could access your camera at a time, but the June 2026 update introduces Multi-App Camera, allowing multiple applications to access the same camera stream simultaneously
.
This matters for businesses using video conferencing. Before this update, if Microsoft Teams was using your webcam and you tried to open OBS Studio to record yourself, you’d get an error. Now, you can run a video call and recording software at the same time, or use multiple video tools concurrently.
For Kent businesses running training sessions, webinars or hybrid meetings, this removes a genuine productivity barrier that’s been frustrating users for years.
Improved Task Manager NPU Monitoring
For businesses investing in new AI-capable PCs,
Task Manager now offers improved NPU usage visibility, with new optional NPU and NPU Engine columns available on Processes, Users and Details pages, along with NPU Dedicated Memory and Shared Memory columns
.
If your organisation is exploring AI tools or AI integrations for business applications, this visibility helps you understand exactly which applications are using your neural processing unit and how intensively. It’s particularly useful for IT managers monitoring resource usage across business PCs.
Known Issues You Need to Watch For
Unfortunately, KB5094126 hasn’t been without problems.
Microsoft has confirmed multiple known issues, including a bug where the Recycle Bin fails to detect the correct file name and Office apps crash
.
Office Application Integration Problems
The most serious issue for businesses involves third-party applications that integrate with Microsoft Office.
Certain third-party applications might be unable to launch Microsoft Office applications or open documents after installing Windows updates released on or after 9 June 2026, affecting applications that use OLE automation to interact with Office, with affected apps including Word, Excel, PowerPoint and Access
.
Reports indicate affected applications may include CCH Engagement, Workpaper Manager, dental software such as Dentrix and Softdent, and Zotero
, though other similar business applications might also experience problems.
If you use accounting software, document management systems or industry-specific applications that open Word documents or Excel spreadsheets automatically, you may encounter this issue.
Microsoft says it’s working on a workaround, but it won’t be available until 14 July 2026
.
Boot Issues on Some Business PCs
The most serious issue reported affects mostly HP business PCs, with some systems rebooting into recovery mode after installing the update, while others report BSOD errors, BitLocker recovery screens or Secure Boot verification errors
.
Affected models include HP EliteBook 840 G10, HP ProBook 460 G11, HP EliteBook 860 G10 and HP ZBook systems. If your business uses HP commercial PCs, test the update on a non-critical system first before rolling it out company-wide.
What Should Your Business Do?
This update includes important security fixes and improvements that you shouldn’t ignore, but the Office integration issue means you need to proceed carefully:
- Test first: Install the update on one or two non-critical PCs and verify that all your business applications still work correctly, especially any that integrate with Office.
- Check HP systems: If you use HP business PCs, be extra cautious and ensure you have current backups before updating.
- Document workflows: Make a list of any third-party applications that automatically open Word, Excel or other Office documents—these are most at risk.
- Plan for the workaround: Microsoft’s fix won’t arrive until mid-July, so factor this timing into your update schedule.
- Monitor Microsoft’s known issues page: Check for updates on resolved issues before deploying widely.
For most Kent businesses, the performance improvements and security updates in KB5094126 outweigh the risks, but careful testing is essential. Unlike previous monthly updates that could be deployed automatically with minimal concern, this one requires a more measured approach.
If you’re running older systems that would benefit from the Low Latency Profile performance boost, the update is particularly worthwhile—just ensure your mission-critical applications are tested first. The Secure Boot certificate updates are mandatory for long-term security, so this update can’t be avoided indefinitely.
Need Help Managing Windows Updates?
Managing Windows updates across your business shouldn’t mean playing Russian roulette with your productivity tools. At Meridian Micro, we help Kent SMEs test, deploy and troubleshoot updates like KB5094126 so you get the security and performance benefits without the business disruption.
We provide comprehensive IT support services including update management, server maintenance and proactive monitoring to keep your systems secure and running smoothly. If you’re concerned about this update or need help resolving issues after installation, get in touch with our team on 01303 883111.