Dark mode changes the default bright background color in Outlook.com and Outlook on the web to a darker color, which is easier on the eyes in low-light environments or if you prefer less bright interfaces.
: Dark mode is only available in the new Outlook.com and Outlook on the web experience.
How do I turn on dark mode?
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At the top of the page, select Settings
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Select the radio button next to Dark mode.
Why does my reading pane have a dark background?
When dark mode is turned on, the reading pane has a dark background to reduce eye strain. You can make the reading pane brighter by selecting 
How do I see the original message formatting?
To see the original message formatting, select
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