Microsoft knows “many millions of users will not buy new devices or pay for extended support” when Windows 10 goes end of life in October, a new lawsuit alleges. “These users,” it claims, “will be at a heightened risk of a cyberattack or other data security incident, a reality of which Microsoft is well aware.”

The lawsuit filed in California by Lawrence Klein, the owner of two Windows 10 laptops set to become obsolete in 8 weeks, “seeks injunctive relief requiring Microsoft to continue providing support for Windows 10 without additional fees or conditions until the number of devices running the operating system falls below a reasonable threshold.”

Around 45% of all Windows users are still on the soon to be obsolete version of the OS and must now act to ensure PCs are safe from attack. That number was dropping, albeit it has seen a reverse following Microsoft’s decision to offer varying support extensions. That means 700 million users will be affected come October 14.