Edge has no way to find out that the random .exe you just downloaded is Microsoft Teams and has not been tampered with. It would be reckless to not warn the user about downloading files from the web.
What would they compare the MD5 against? This would mean having all the MD5 files of all the software on all the internet baked right into edge. Or they would have to configure (probably multiple) repositories of known good MD5s to check against. All that’s quite a lot of work just to save you from having to click “Yes” once more.
If you really want to only use software that MS deems safe, why not use the Microsoft store instead of downloading the software yourself?
We are arguing about this. And I’m doing this because you’re not getting that what you’re asking for is impossible. Even if you’re downloading a file from a server called microsoft.com via SSL, the file may still be corrupt. The chance is slim, but still the risk is too big for Microsoft to tell their users, “Go ahead, it’s fine.”
It's not inherently bad, at least from the user's perspective, but Windows Defender will make you click "more info" or something before giving you the "run anyways" button since it thinks it's a risk. I've never gotten a virus doing this, though
On MacOs it's so stupid. Instead of double-clicking on the new program to open it, you need to right-click and hit "Open" from the drop down menu. Only then does it even give you the option to open the program anyway.
Because viruses fake a licence so they don't get detected that easily. Which means the extremely expensive license you have to buy from Microsoft is useless for actual security.