The Microsoft Defender app is designed to help keep you and your family safe from malicious websites, identity theft, and other online threats. As part of this, Microsoft collects diagnostic data to keep you safe.
What Microsoft can see
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Device information such as OEM information, model, operating system (OS), device id
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Domain name of potentially unsafe websites
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Your Microsoft account information such as name and username
What Microsoft can't see
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Call and web history
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Location
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Email content and text messages
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Contacts
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Passwords
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Calendar
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Any personal data such as photos, videos, and chats.
For more information see the Microsoft Privacy Policy.