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Microsoft Defender Antivirus

What Microsoft Defender Antivirus is
Microsoft Defender Antivirus is Microsoft’s antivirus software for Windows 10 and Windows 11. It is available through a free plan and follows a freemium pricing model. The built-in Windows plan provides real-time, always-on protection against viruses and malware and integrates with Windows Security. Ransomware protection is included. Microsoft also lists Microsoft 365 Personal, Family, and Premium plans. Personal covers one person and up to five devices simultaneously and includes 1 TB of cloud storage. Family and Premium cover one to six people, allow up to five devices per person, and include up to 6 TB of cloud storage. The listed product scope is antivirus for Windows, while parental controls and a password manager are not included. Microsoft, headquartered in Redmond, Washington, was founded in 1975.
Who it suits
It suits Windows 10 and Windows 11 users seeking antivirus protection, including people who want to use the built-in free plan. Microsoft 365 options suit households or individuals needing the listed device and cloud-storage allowances.
What it does well
- Free plan available
- Real-time, always-on protection
- Ransomware protection included
- Windows Security integration
- Supports Windows 10 and 11
What to know first
- No parental controls
- No password manager
- Windows platform only
Limits
The free built-in plan provides antivirus and ransomware protection but has no parental controls or password manager. Microsoft 365 Personal covers one person and up to five devices simultaneously with 1 TB storage; Family and Premium cover one to six people, up to five devices per person, and up to 6 TB storage.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Microsoft Defender Antivirus built into Windows | Real-time, always-on antivirus protection · Virus and malware protection · Windows Security integration | On request |
| Microsoft Defender Antivirus built into Windows | Real-time, always-on antivirus protection · Virus and malware protection · Windows Security integration | On request |
| Microsoft 365 Personal | 1 person · Up to 5 devices simultaneously · 1 TB cloud storage | On request |
| Microsoft 365 Personal | 1 person · Up to 5 devices simultaneously · 1 TB cloud storage | On request |
| Microsoft 365 Family | 1 to 6 people · Up to 5 devices per person · Up to 6 TB cloud storage | On request |
| Microsoft 365 Family | 1 to 6 people · Up to 5 devices per person · Up to 6 TB cloud storage | On request |
| Microsoft 365 Premium | 1 to 6 people · Up to 5 devices per person · Up to 6 TB cloud storage | On request |
| Microsoft 365 Premium | 1 to 6 people · Up to 5 devices per person · Up to 6 TB cloud storage | On request |
As microsoft.com lists them, read 20 Sept 2026. The maker's own page has the final word.
Getting started
- Open Microsoft’s comprehensive security website
- Use a Windows 10 or Windows 11 device
- Access the built-in Microsoft Defender Antivirus through Windows Security
- Choose Microsoft 365 Personal, Family, or Premium if its stated coverage fits
- Use the selected plan’s device and cloud-storage allowances
Verdict
Microsoft Defender Antivirus covers core antivirus needs on supported Windows PCs without requiring a paid plan. Microsoft 365 plans add stated people, device, and cloud-storage allowances, but the product does not list parental controls or password management.
Questions
Is Microsoft Defender Antivirus free?
Yes. It has a free plan, including the antivirus built into Windows.
Which Windows versions are supported?
The listed supported platforms are Windows 10 and Windows 11.
What protection does the built-in plan include?
It includes real-time, always-on antivirus protection, virus and malware protection, ransomware protection, and Windows Security integration.
Does it include parental controls or a password manager?
No. The facts list neither parental controls nor a password manager.
What Microsoft 365 plans are listed?
Microsoft lists Personal, Family, and Premium. Personal covers one person and up to five devices with 1 TB storage; Family and Premium cover one to six people, up to five devices per person, and up to 6 TB storage.
Who makes Microsoft Defender Antivirus?
Microsoft makes it. Microsoft is headquartered in Redmond, Washington, USA, and was founded in 1975.
Facts from Microsoft Defender Antivirus's own pages
- Founded
- 1975 · microsoft.com, 23 Sept 2026
- Free plan
- Yes · microsoft.com, 20 Sept 2026
- Headquarters
- Redmond, Washington, USA · microsoft.com, 23 Sept 2026
- Parental controls
- No · microsoft.com, 20 Sept 2026
- Password manager
- No · microsoft.com, 20 Sept 2026
- Protection scope
- antivirus · microsoft.com, 20 Sept 2026
- Ransomware protection
- Yes · microsoft.com, 20 Sept 2026
- Supported platforms
- Windows 10,Windows 11 · microsoft.com, 20 Sept 2026
Where Microsoft Defender Antivirus stands on Freedom251
- Antivirus software#14 of 120