On October 10, 2025, Microsoft Corporation (MSFT) stock closed at $510.96 (-2.19%), with after-hours trading at $511.48 (+0.10%). The decline coincides with significant company news: Microsoft is preparing for the end of support for Windows 10, Office 2016, and Office 2019, all reaching end-of-life in October 2025, marking a major transition for millions of users and businesses as the company shifts focus to Windows 11 and newer Office products[1][2][3][5][6]. Additionally, Microsoft 365 services experienced a notable outage in North America on October 9 due to infrastructure misconfiguration, briefly disrupting Teams and other cloud services before resolution[4]. These events, covered by tier-1 sources, represent major operational and strategic shifts likely influencing investor sentiment and stock price movement.