Did you open Outlook today and think, "Why does everything look different?" Maybe the message list looks squashed, the reading pane is in the wrong place, or the whole layout feels unfamiliar. Happily ...

To change the default browser in Outlook 365, go to File > Options > Advanced, then scroll to “Link Handling” and set “Open hyperlinks from Outlook in” to your preferred browser, like Chrome.

You can change notification sounds for emails and calendar events directly within the new Outlook app for Windows. In classic Outlook, you can choose whether to play a sound when a new email arrives.

I don't know that its possible. The new view is actually much better. We decided just to leave it like that (in fact I usually wouldn't change it for my users for at least a week). I haven't had any ...