Core Viewpoint - Microsoft faced significant issues with Windows 11 following a routine security update in January 2026, which caused critical functionalities like shutdown and remote login to fail, leading to an emergency out-of-band update to address these problems [1][3][9]. Group 1: Update Issues - The January Patch Tuesday update was intended to fix security bugs but instead created system-level failures, affecting basic functions such as shutdown, restart, and sleep [5][7]. - The update was extensive, covering Windows and multiple underlying components, and aimed to fix over 100 bugs, including at least one vulnerability that was confirmed to be exploited in the wild [6]. Group 2: Specific Failures - Users reported that their systems appeared to initiate shutdown processes but remained operational, with some devices even "reviving" after shutdown attempts [5][9]. - The failure of Remote Desktop login was another critical issue, with users experiencing repeated credential verification failures, severely impacting remote work and management scenarios [11][12]. Group 3: Emergency Response - Microsoft acknowledged the severity of the issues and released an emergency update (KB5077797) on January 17, 2026, to restore normal shutdown and sleep functions, as well as to address the Remote Desktop login failures [9][10][12]. - Despite the emergency fix, another bug was identified related to Outlook, which could freeze or become unresponsive, indicating ongoing issues with the January update [12][13]. Group 4: Testing and Quality Concerns - The problems raised questions about the effectiveness of the Windows Insider Program in covering real-world usage scenarios, as the update led to critical failures that users encountered immediately [14][15]. - The rapid pace of updates, coupled with a focus on AI features, has contributed to a decline in public perception of Windows 11, with frequent critical updates eroding user trust [15][16].