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Outlook View in Browser Ignores Default Browser and Opens IE When Office 365 Doesn't Even Support IE
With the new Edge I was hoping to finally see the back of Internet Explorer and whilst Microsoft have dropped support in some areas there seem to be key places where it is still the one that is selec...
That's an OS level setting, basically you need to change the associations for .MHT/.MHTML file types. Not all browsers expose this as supported file type though, so you might end up needing to change it directly in the registry.
Totally flabbergasted when this just happened to me. I'm sure I saw a note that IE was dead over the next year.