3 6 Ke·2026-01-21 07:45Core Insights - Microsoft faced significant issues with Windows 11 following a routine security update in January 2026, which caused critical functionalities like shutdown and Remote Desktop login to fail [1][3][8] Group 1: Update Issues - The January Patch Tuesday update, intended to fix security bugs, instead led to severe system-level failures, including the inability to shut down, restart, or enter sleep mode on some Windows 11 devices [3][4] - Microsoft identified the root cause as a compatibility issue with the System Guard Secure Launch feature, which is designed to enhance security during the boot process [4][6] Group 2: Emergency Response - In response to the escalating issues, Microsoft released an out-of-band emergency update (KB5077797) on January 17, 2026, to restore normal shutdown and sleep functions [6][7] - The same update also addressed Remote Desktop login failures, which had severely impacted remote work and IT management [8] Group 3: Ongoing Concerns - Despite the emergency update, Microsoft acknowledged that another bug was introduced with the January update, affecting Outlook's POP account configuration, which remains unresolved [8] - The frequency of critical update failures has raised concerns among developers and IT professionals regarding the effectiveness of the Windows Insider Program and the overall quality control of Windows 11 updates [9]