Microsoft Defender is a built-in feature of Windows 10 and Windows 11, providing millions of users worldwide with basic protection against viruses, malware, and other digital threats at no cost. But how does this integrated antivirus solution measure up to established programs like Bitdefender, Kaspersky, or Norton?
What is Microsoft Defender?
Microsoft Defender (formerly known as Windows Defender) is Microsoft’s integrated security solution. Without the need for additional installations, it offers:
- Real-time protection against viruses, trojans, and ransomware
- Automatic updates via Windows Update
- Resource-efficient background operation
This makes it a convenient solution, especially for home users: no configuration, no licenses—protection is activated right away.
How Well Does It Protect in Everyday Use?
Microsoft Defender has seen significant improvements in recent years. According to AV-Test (February 2025), it scored a perfect 18 out of 18 points in protection, performance, and usability. In AV-Comparatives’ test (September 2024), it achieved an excellent online detection rate of 99.84%—a strong result for a free tool.
However, its offline detection rate sits at just 68.8%. So if you frequently work without internet access, it may be worth exploring alternatives.
Microsoft Defender Compared to Other Antivirus Solutions
Defender vs. Bitdefender: Bitdefender Total Security offers:
- Very high malware detection rates
- Built-in VPN
- Parental controls and system optimization tools
Bitdefender is ideal for users seeking more advanced features and convenience. Microsoft Defender, by contrast, remains a minimalist and free alternative for everyday use.
Defender vs. Kaspersky: Kaspersky stands out with:
- Strong detection capabilities
- A user-friendly interface
- Extras like a password manager and secure online payment features
However, Germany’s BSI (Federal Office for Information Security) continues to advise against using the Russian software. Microsoft Defender, on the other hand, is considered privacy-compliant and trustworthy.
Defender vs. Norton 360: Norton 360 delivers a comprehensive security package with:
- VPN
- Cloud backup
- Password manager
- Parental controls
Microsoft Defender offers fewer features but makes up for it with simplicity and low resource usage.
How to Enable or Disable Microsoft Defender
To Enable:
- Open “Settings”
- Go to “Privacy & Security” > “Windows Security”
- Select “Virus & Threat Protection”
- Under “Manage Settings,” turn Microsoft Defender on
To Disable: In the same section, you can temporarily turn off protection. This is only advisable if another antivirus program is installed.
What is Microsoft Defender Smartscreen?
Smartscreen is a security filter that:
- Blocks malicious websites
- Warns about suspicious downloads
- Provides extra protection while browsing the web
If needed, you can disable it in “App & Browser Control” under the Windows Security settings.
Microsoft Defender on Other Platforms
With an active Microsoft 365 subscription, Microsoft Defender is also available for macOS, Android, and iOS. The mobile version offers web protection, device monitoring, and more.
Pricing:
- Windows: Free
- Microsoft 365 Family (6 users): approx. €129/year
- Microsoft 365 Single (1 user): approx. €99/year
Conclusion
Microsoft Defender has evolved into a serious security contender. For many home users, its built-in protection is more than sufficient. However, those who seek advanced features and more control will find suitable alternatives in Bitdefender, Norton, and others.