Here at How-To Geek we love dark mode and use it a lot. If you’re an Office user who wants a darker experience, here’s how to turn dark mode on in the Outlook web app.
Dark mode is only available in the new modern Outlook design. If you haven’t opted-in to this yet, it’ll soon be there automatically for you, as Microsoft has announced that it will be moving everyone over to the new experience over the next few months.
To turn dark mode on, click on the Settings cog in the top right, and switch on the Dark Mode option.
That’s all there is to it. The app instantly turns to dark mode, which is a lot kinder on the eyes after the previous all-white incarnation.
If you want the reading pane, and just the reading pane, to be white, there is a toggle in the selected email that lets you do this.
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Source: How-To Geek