Windows 10 does disable some third-party security software, Microsoft’s application compatibility teams found that roughly 95 per cent of Windows 10 PCs had an antivirus application installed that was already compatible with Windows 10 Creators Update,” said Rob Lefferts, director of security in the Windows and Devices group
But what about the 5 percent that weren’t compatible in Microsoft’s eyes? Lefferts says:"For the small number of applications that still needed updating, we built a feature just for AV apps that would prompt the customer to install a new version of their AV app right after the update completed. To do this, we first temporarily disabled some parts of the AV software when the update began. We did this work in partnership with the AV partner to specify which versions of their software are compatible and where to direct customers after updating".
Kaspersky is worried that Microsoft is trying the same trick, but – based on Lefferts' post – Redmond is ready to fight such claims "it has designed its own security software to only kick in when "an AV subscription expires, and the AV application decides to stop providing protection to the customer."