China's Ministry of State Security has told some state-linked organizations to remove a customized version of Windows 10 from their machines, Bloomberg reports, citing people familiar with the matter. The order reportedly accelerates a planned retirement that the software's developer had scheduled for February 2027, and it sent Chinese OS vendors' shares surging, with Hunan Kylinsec and Archermind both hitting Shanghai's 20% daily limit and China National Software climbing 10%. Bloomberg's sources attributed the directive to data security concerns but didn't specify what vulnerabilities Beijing is worried about.
The affected software is the government edition developed by C&M Information Technologies (CMIT), a joint venture set up in 2016 between Microsoft and state-owned China Electronics Technology Group, with the Chinese side holding the majority stake. The build is based on Windows 10 Enterprise but strips out OneDrive and other consumer-facing components, disables certain native functions, keeps updates and activation inside China, and lets government users substitute Chinese encryption algorithms for Microsoft's standard cryptography. China Customs and Shanghai's Commission of Economy and Informatization were among the first pilot customers when the edition launched in 2017.
Microsoft ended mainstream Windows 10 support globally in October 2025, which left CMIT's edition as the only Windows still officially sanctioned for Chinese government use. "Microsoft is not aware of a security incident affecting this product," a company spokesperson told Bloomberg, adding that it continues to receive regular security updates.
Beijing banned Windows 8 from government procurement in 2014, ordered a three-year replacement of foreign PCs in government offices starting in 2019, and in 2022 told central agencies and state firms to scrap foreign-branded computers entirely. The domestic stack built to absorb that demand now includes Kylin V10, UnionTech's UOS, and Huawei's HarmonyOS 5 laptops, and it reaches down to the silicon in systems like Huawei's Qingyun desktops running the homegrown Kirin 9000X.
StatCounter's traffic data shows how little of that campaign has reached the consumer market. Windows accounted for 87.64% of Chinese desktop web traffic in July 2026, and Windows 10 alone still made up 43.56% of Chinese Windows usage, compared with 50.01% for Windows 11, ten months after mainstream support ended. Roughly two in five Chinese desktops are currently running an unsupported Microsoft OS, the gap that CMIT's edition was meant to close for government users.
It's not clear what the scope of the new directive is, with Bloomberg's reporting covering “some” state-linked entities. CMIT didn't respond to the outlet's request for comment.