Microsoft Defender: Antivirus

Microsoft Corporation

In-app purchases

About this app

Stay safer online with Microsoft Defender1. Stay protected at home, work, or on the go. Get real-time threat alerts and expert guidance—all in one app. Defender is available with a Microsoft 365 Personal, or Family, or Premium subscription.

All-in-one security app
• Protect your devices against malicious threats with antivirus scanning3, multidevice alerts, and expert guidance.
• Check the security status of your family’s devices.
• Get timely threat alerts and recommended actions across your devices.

Trusted device protection
• Always-on, professional grade protection for your devices against new and existing threats3.
• Get alerted if malicious apps are found and take steps to remove the threat.
• Continuously scans for harmful links before you click on them to help protect you from malicious threats.


1. Microsoft 365 Personal, Family, or Premium subscription required. Sign in with your Microsoft account. App is currently not available in certain regions.
2. If you are a member of a business or organization, login with your work or school email. Your school or business is required to have a valid license or subscription.
3. Does not replace existing malware protection on iOS and Windows devices.

Ratings and reviews

I pay for a subscription to 365, It comes with almost all the office apps they offer as well as defender and a few other perks well worth the cost. Except that defender doesn't seem to actually work, won't allow me to update my information or hold the settings if it does. It blocked nothing as a matter of fact since installing defender my account and devices seem to be infected and even have captive portal maleware and such and don't receive calls, my files and accounts are steady worsening

I got the MD with my 365 Pilot more than 2 years ago. Never had any problems. Suddenly, since a week ago, I keep getting notices saying my MD is off and my device is not protected. Try as I might, it just will not turn on again. I'm so frustrated. I honestly feel like deleting the damn app. .

Authentication is broken. Unable to sign in with password, leads to 401 error. Unable to utilize hardware passkey (Yubikey), as it spams the prompts until the application hangs and needs to be killed when the USB C key is inserted. Functionally useless without being signed in. Will update review if this ever gets resolved, otherwise this app is completely pointless to have installed.