https://www.techradar.com/news/microsoft-wants-you-to-open-more-of-your-links-in-the-edge-browser

Are you using Microsoft Edge much at the moment? You might soon be opening it up a lot more if you're using a preview version of Windows 10, because Microsoft is testing out the idea of forcing you to use Edge to open links from Windows Mail – in the same way that links from Mail on iOS have to open in Safari.

Of course you can still use an alternative browser for all your other web surfing needs, but if Edge isn't your program of choice and you spend a lot of time clicking on links from your inbox, it's easy to imagine this is going to get pretty annoying very quickly.