China's Ministry of State Security has directed state-linked organizations to remove a tailored version of Windows 10 from their systems, expediting a planned phase-out initially set for February 2027. This directive is driven by data security concerns, although specific vulnerabilities were not disclosed. The customized version, developed by C&M Information Technologies (CMIT), is based on Windows 10 Enterprise but modified to exclude consumer features and ensure updates remain within China. Since its launch in 2017, it has been used by various central agencies. The Chinese government has also encouraged the elimination of foreign-branded computers, leading to the emergence of domestic operating systems. Despite these efforts, as of July 2026, Windows held an 87.64% share of desktop web traffic in China, with Windows 10 accounting for 43.56% of usage. Approximately two in five Chinese desktops still run an unsupported version of Microsoft's software.