Cybersecurity expert Eugene Kaspersky, founder of the antivirus company that bears his name, called out Microsoft for disabling third-party antivirus programs during the Windows 10 upgrade process.

In a long-winded blog post that rambles and takes 300 words to get to the point, he criticizes Microsoft’s walled garden approach to Windows 10, something MacOS has done forever, but then he gets to the main point: Windows 10 does everything it can to disable third-party AV programs and use only Microsoft’s products.

“When you upgrade to Windows 10, Microsoft automatically and without any warning deactivates all ‘incompatible’ security software and in its place installs… you guessed it—its own Defender antivirus. But what did it expect when independent developers were given all of one week before the release of the new version of the OS to make their software compatible?” he writes.

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