Microsoft has quietly begun rolling out an optional Windows 11 preview update — KB5074105 — that bundles several user-facing features, quality fixes, and a long-awaited change to Smart App Control. This update, released on October 8, 2024, as part of Microsoft's "C" release schedule for optional non-security previews, brings the OS build to 26100.2152. While optional, it offers a glimpse into features that will be included in the next mandatory Patch Tuesday update, allowing users to test improvements before wider deployment.

What's New in KB5074105?

The KB5074105 update introduces several notable features and improvements. The most significant addition is Cross-Device Resume, a feature that allows users to pause activities on one Windows 11 device and resume them on another. This functionality requires users to be signed in with the same Microsoft account on both devices and have the feature enabled in Settings > System > Cross-Device Resume. Microsoft's implementation builds on existing ecosystem integration but represents a more seamless handoff experience than previous solutions.

Another major change is the Smart App Control toggle, which gives users more control over this security feature. Smart App Control, designed to block potentially malicious apps, can now be disabled directly through Windows Security settings rather than requiring a complex workaround or registry edit. This addresses one of the most common complaints about the feature since its introduction.

Technical Improvements and Fixes

Beyond the headline features, KB5074105 includes several technical improvements:

  • MIDI 2.0 modernization: The update enhances MIDI (Musical Instrument Digital Interface) support with improved functionality for music production and audio applications
  • Taskbar reliability: Fixes an issue where the taskbar might become unresponsive or fail to load properly
  • File Explorer stability: Addresses problems with File Explorer crashing or freezing during certain operations
  • Windows Update improvements: Enhances the reliability of update installation and reduces failed update attempts
  • Input method editor fixes: Resolves issues with certain IMEs becoming unresponsive or displaying incorrect characters

Microsoft has also included various security enhancements and performance optimizations, though specific details are limited in the official release notes.

Community Response and Real-World Testing

Early adopters on WindowsForum.com and other community platforms have begun testing KB5074105, with mixed but generally positive feedback. The Cross-Device Resume feature has generated particular interest, though some users report limitations in its current implementation.

"I tried Cross-Device Resume between my desktop and laptop," writes one WindowsForum user. "It worked perfectly for Microsoft Edge tabs and some Office documents, but I couldn't get it to work with third-party applications. The feature shows promise, but it needs broader application support to be truly useful."

Another community member notes: "The Smart App Control toggle is a welcome change. I had to disable it previously because it kept blocking legitimate development tools, and the process was cumbersome. Having a proper toggle in Windows Security makes managing this feature much easier."

Some users have reported installation issues, particularly on systems with certain third-party security software or customized configurations. "The update failed twice on my system," reports a WindowsForum contributor. "I had to temporarily disable my antivirus and run the Windows Update troubleshooter before it would install successfully."

Cross-Device Resume: How It Works and Limitations

Cross-Device Resume represents Microsoft's continued push toward a more connected Windows ecosystem. When enabled, the feature monitors active applications and documents, creating resume points that can be transferred to other devices. According to Microsoft documentation, the feature uses cloud synchronization through OneDrive and Microsoft account services to transfer state information between devices.

Current limitations include:
- Primarily supports Microsoft applications (Edge, Office suite)
- Limited third-party application compatibility
- Requires stable internet connection for synchronization
- Both devices must be running Windows 11 with the feature enabled

A WindowsForum user with multiple devices comments: "The concept is great, but the execution feels like a first-generation feature. I can see this becoming incredibly useful once more applications add support. Right now, it's more of a proof of concept than a daily driver feature."

Smart App Control: From Mandatory to Manageable

Smart App Control's transition from a mandatory security feature to a user-controllable option represents a significant shift in Microsoft's approach. Originally introduced as a always-on security layer, Smart App Control uses AI and Microsoft's intelligence database to block potentially unwanted applications. While effective at preventing malware installation, it sometimes blocked legitimate software, particularly development tools, utilities, and less common applications.

"I'm a developer, and Smart App Control was constantly interfering with my workflow," explains a WindowsForum member. "It would block Python scripts, PowerShell modules, and even some compiled executables from trusted sources. Having to disable it completely was overkill, but the previous workarounds were too complex for most users. This toggle strikes a good balance."

The new toggle appears in Windows Security > App & Browser Control > Smart App Control. Users can choose between "On," "Off," or "Evaluation" modes, with the latter allowing Windows to assess whether the feature should remain enabled based on usage patterns.

Installation Considerations and Known Issues

Before installing KB5074105, users should consider several factors:

System Requirements:
- Windows 11 version 24H2 or later
- Sufficient storage space (the update is approximately 800MB)
- Stable internet connection
- Microsoft account for Cross-Device Resume functionality

Potential Issues:
- Compatibility problems with certain antivirus software
- Driver conflicts, particularly with older hardware
- Temporary performance impacts during initial post-installation indexing
- Some users report increased memory usage after installation

A WindowsForum administrator advises: "As with any optional update, I recommend creating a system restore point before installing KB5074105. While most users won't experience issues, having a rollback option is always wise with preview updates."

MIDI 2.0 Modernization: What It Means for Users

The MIDI 2.0 improvements in KB5074105 may seem niche but represent important groundwork for audio professionals and enthusiasts. MIDI 2.0 offers several advantages over the decades-old MIDI 1.0 standard, including higher resolution, better timing, and bidirectional communication between devices.

"The MIDI 2.0 support in this update is actually a bigger deal than it might appear," notes a music production professional on WindowsForum. "Windows has lagged behind macOS in professional audio support for years. These improvements, while incremental, show Microsoft is serious about competing in creative professional spaces."

Performance Impact and System Requirements

Early testing suggests KB5074105 has minimal performance impact for most users. Benchmark comparisons show:

  • Boot times: No significant change for most systems
  • Memory usage: Slight increase (typically 50-100MB) due to additional services
  • CPU utilization: Normal range with occasional spikes during synchronization tasks
  • Battery life: No noticeable impact on laptops and tablets

However, users with older hardware or limited system resources may experience more pronounced effects. "On my Surface Pro 7, I noticed slightly faster battery drain after installing the update," reports a WindowsForum user. "It's not dramatic, but it's noticeable if you're paying attention."

The Future of Windows 11 Updates

KB5074105 represents Microsoft's continued refinement of Windows 11's update delivery strategy. By releasing optional preview updates mid-month, Microsoft gathers valuable feedback before mandatory Patch Tuesday deployments. This approach has evolved significantly since Windows 10's sometimes problematic update cycles.

"Microsoft seems to have learned from past update issues," observes a long-time WindowsForum contributor. "These optional previews let enthusiasts test features and report problems before they reach the general population. It's not perfect, but it's better than the 'surprise update' approach of the Windows 10 era."

Looking ahead, features introduced in KB5074105 will likely see refinement in future updates. Cross-Device Resume in particular has room for expansion, potentially integrating with Android devices through Microsoft's Phone Link application or extending to Xbox consoles.

Should You Install KB5074105?

The decision to install this optional update depends on your specific needs and risk tolerance:

Install if:
- You use multiple Windows 11 devices and want to test Cross-Device Resume
- You've had issues with Smart App Control and want easier management
- You work with MIDI devices or audio production software
- You're comfortable troubleshooting potential issues

Wait if:
- Your system is mission-critical with zero tolerance for instability
- You rely on applications that might conflict with new features
- You prefer to wait for mandatory updates with broader testing
- You're not experiencing any of the issues addressed in this update

Conclusion

Windows 11 KB5074105 represents a balanced update that addresses both feature requests and quality-of-life improvements. The addition of Cross-Device Resume moves Windows closer to the seamless ecosystem experience that users expect in 2024, while the Smart App Control toggle acknowledges that one-size-fits-all security solutions don't work for all users.

As with any preview update, some roughness around the edges is expected. Early adopters should approach with appropriate caution, particularly on production systems. However, for users interested in the latest Windows 11 developments, KB5074105 offers a compelling look at Microsoft's direction for the platform.

The community feedback from WindowsForum and other platforms will undoubtedly shape how these features evolve in future updates. Microsoft's willingness to make Smart App Control optional based on user feedback suggests a more responsive approach to Windows development—one that balances security with usability in ways that previous Windows versions sometimes struggled to achieve.