AV-Comparatives - Is Microsoft Defender Enough? Putting Built-In Protection into Cont

[harlan4096]

Is Microsoft Defender Enough? Putting Built-In Protection into Context

26. May 2026

On 13 January 2026, Microsoft published an article titled “Trusted antivirus protection for PCs” in the Windows Learning Center. The core message: Windows 11 already comes with solid, real-time security in the form of Microsoft Defender Antivirus, no subscription, no installation required, and “for many users, this level of protection is plenty.”

Microsoft also notes that third-party tools offer additional features such as identity monitoring or built-in VPNs.

A sharper formulation of the same idea in April on the same website was summarized medially with the headline that Windows 11 essentially no longer required a third-party antivirus. That April article appears to have been taken down in the meantime, and we see this as a constructive step. The current Learning Center text is noticeably more measured: it positions Defender as a strong baseline, acknowledges that third-party tools deliver capabilities beyond the basics, and stops short of claiming that Defender is sufficient in every scenario.

This article here is not a counter-argument to Microsoft. Defender has improved substantially over the past decade, and modern Windows systems are considerably better protected by default than earlier generations. The purpose of the following sections is to put the current discussion around built-in protection into a broader technical and operational context, drawing on our public test data and on developments across the wider industry, including from Microsoft itself.

What Independent Test Data Shows

AV-Comparatives has tested Microsoft Defender as a regular participant in the Consumer Main Test Series since 2007. The results show a product that has matured into a credible modern security solution. They also show measurable differences between products in specific areas, which is what independent testing exists to surface.

Full Report