Comment by jwells89

The online school I’m attending is like this with its email. My options are to run the Outlook for Mac desktop app (which oddly seems to be a different beast than “new” Outlook on Windows) or keep Outlook webmail open in a tab. Not even Apple Mail via its Exchange support is permitted.

I ultimately landed on keeping the desktop app open to reduce browser clutter and for the icon notification badge so I don’t miss any important emails.