https://www.cnet.com/news/microsoft-considers-forcing-windows-10-mail-users-to-use-edge-browser/

What are you willing to give up in the name of security?

Microsoft is testing an update for its Windows 10 software that powers PCs that changes the way it opens links from the email app. If you click a link, it won't open in Google's Chrome, Mozilla FireFox or some other browser you might have installed. Instead, in this version, it will only open in Edge, Microsoft's specialized browser built for speed and security, regardless of what browser you have installed on your desktop.