Windows 11 January 2026 Update Causes Shutdown Bug on Enterprise, IoT PCs

• Microsoft's January 2026 security update (KB5073455) for Windows 11 is causing a shutdown bug on some systems.
• Affected PCs, specifically Windows 11 Enterprise and IoT editions with Secure Launch enabled, restart instead of shutting down or hibernating.
• Consumer editions like Windows 11 Home and Pro are not impacted by this specific shutdown issue.
• A temporary workaround involves using Command Prompt with 'shutdown /s /t 0' to safely shut down the system.
• Microsoft is also investigating a separate issue affecting Outlook POP account profiles after the same update.

Why It Matters: Windows 11 January 2026 update causes a shutdown bug on Enterprise/IoT PCs with Secure Launch.