Mar 25, 2026 · Learn how to manage, configure, and use Microsoft Defender Antivirus, built-in anti-malware and antivirus protection.

Learn about getting started with the new Microsoft Defender on your personal devices including Windows, Mac, Android, and iOS.

If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by: Scanning the following QR code Searching …

Microsoft Defender's web protection helps protect you against malicious sites that are being used for phishing or spreading malware. Available on Windows, Android, and iOS.

Explore the Microsoft Defender products and services available for your business or organization.

May 14, 2026 · Learn about security intelligence updates, platform updates, and engine updates for Microsoft Defender Antivirus, including rollback and support options.

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

Apr 23, 2026 · Learn how Microsoft Defender SmartScreen protects against phishing or malware websites and applications, and the downloading of potentially malicious files.

Jan 28, 2026 · Your security center in Defender for Business is the Microsoft Defender portal. Learn how to navigate the portal, and see your next steps.

Jun 15, 2026 · Users can learn how to view and manage quarantined email messages in Microsoft 365 that were meant to be delivered to them.