Windows Defender has a market share of 50%

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Microsoft integrated the security solution Windows Defender Antivirus deeply in the Windows operating system. It is enabled by default on the company's Windows 10 operating system so that it can protect devices from the moment they are booted for the first time.

Previously, systems did not really have protection until users decided to install antivirus solutions on devices.

Microsoft revealed recently that Windows Defender Antivirus has a share of more than 50% on Windows; the solution is the primary antivirus solution on more than 500 million Windows devices and growth continues.

The market share of Windows Defender Antivirus makes it a prime target for attacks that bypass its protections. If an attacker manages to find a way through the defenses offered by the security solution, a large part of Windows systems would be vulnerable as a consequence. Kaspersky called Microsoft out in 2016 stating that Microsoft's integration was anti-competitive.

Microsoft told ZDnet that it predicted that Windows Defender Antivirus would become a high priority target and that it invested in defensive mechanisms to improve protections. In Windows 10 version 1903, Windows Defender got a new anti-tamper protection feature, and it uses a sandbox since 2018.

The most recent test on AV-Test, an independent test site for security solutions, awarded Windows Defender Antivirus a perfect score. Microsoft's security program got the perfect score in protection, performance, and usability.

Granted, it was not the only tool that received a perfect score in the test. Three third-party security solutions -- Norton Security, Kaspersky Internet Security, and F-Secure Safe -- managed to get a perfect score as well. Five additional security solutions got recommendations as well.

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