zdnet[.]com/article/microsoft-defender-coming-soon-to-a-group-of-family-devices-including-phones/
Microsoft originally sold their security software as a separate product, before they decided to bundle it into Windows. Today Microsoft Security is a huge biz, focusing on protecting corporate clients, especially in the cloud. And it looks like they're coming full circle, with a separate consumer app that, according to Foley will require a Microsoft 365 [Office 365] subscription once it leaves its current preview status.
The Defender preview will provide consumers with a centralized view for managing and monitoring their online security status. They'll be able to see the status of their Windows PC plus up to four additional devices (as long as they are signed in using the same personal Microsoft account), including phones and Macs. Users will be able to add or remove devices and view malware protections on all covered devices. The app will also provide recommendations for ensuring better data, computer and phone protection, delivering security tips, and providing real-time security alerts.
Search for Defender in the Windows store app.