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In classic Outlook, select File > Options > General.
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Under Personalize your copy of Microsoft Office, next to Office Theme, select the drop-down arrow and select a theme.
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Select OK.
To change background colors, see Change the background color of a message.
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Under Mail in new Outlook​​​​​​​, on the View tab, selectÂ
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Select General > Appearance.
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Select a theme from the list of options. (The color change can be seen immediately in the Settings dialog.)
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Select Save to keep the change or Discard to revert to the previous color.
