Where to find the theme settings in Outlook

The color theme controls are in Outlook's settings menu, but the exact path depends on whether you use Outlook on the web, Outlook desktop for Windows, or Outlook for Mac. All three versions let you switch between light, dark, and sometimes a system-default option that matches your computer's settings. The change takes effect when ready and applies to the entire interface — menus, sidebars, message pane, and all.

You do not need to restart Outlook or sign out and back in. If you switch themes and the change does not appear right away, try closing and reopening the current message or folder you are viewing.

Key Takeaways

  • Outlook on the web: go to Settings (gear icon) → View → choose Light, Dark, or Use system setting.
  • Outlook desktop on Windows: go to File → Options → General → Office Theme, then pick a color scheme.
  • Outlook for Mac: go to Outlook → Preferences → General → Appearance, then select your theme.
  • The dark theme reduces eye strain in low-light environments and uses less battery on devices with OLED screens.
  • Your theme choice syncs across devices if you use the same Microsoft account, though web and desktop versions may update at different speeds.

Changing the theme in Outlook on the web

Open Outlook in your web browser and look for the gear icon in the top right corner of the screen. Click it and select Settings from the dropdown menu. In the Settings panel that opens on the left, click View. Scroll down until you see the Theme section — you will see three options: Light, Dark, and Use system setting.

Click the option you want. Light mode shows a white background with dark text. Dark mode shows a dark background with light text. Use system setting means Outlook will match whatever theme your computer or phone is set to — if you switch your device to dark mode at night, Outlook will follow automatically. The change happens when ready; you do not need to refresh the page.

Changing the theme in Outlook desktop for Windows

Open Outlook and click File in the top left corner. Select Options from the menu. In the Outlook Options window, click General on the left side. Look for the section labeled Office Theme — you will see several color options displayed as boxes or buttons.

The options usually include Colorful (the default, with accent colors), Dark Gray, Black, and sometimes White. Click the one you prefer. Some versions of Outlook also show a Use system setting option here. Once you click your choice, click OK at the bottom of the window to save and close the settings. The theme change appears when ready in your Outlook window.

Changing the theme in Outlook for Mac

Click Outlook in the menu bar at the top of your screen, then select Preferences. In the Preferences window, click General. Look for the Appearance section — you will see options for Light, Dark, and sometimes Use system setting. Click the one you want and close the Preferences window.

On Mac, the dark theme is particularly useful if you work in dim lighting or use your Mac in the evening, since it reduces the brightness of the screen. If you have multiple Mac devices signed into the same Microsoft account, the theme preference may take a few minutes to sync across them.

Why you might choose dark mode over light mode

Dark mode reduces eye strain when you read email in low-light environments — the bright white background of light mode can feel harsh in dim rooms or at night. If your device has an OLED screen (common on newer laptops and phones), dark mode also uses slightly less battery power because OLED pixels that display black are actually turned off.

Light mode, on the other hand, is often easier to read in bright sunlight or well-lit offices, and some people find it less tiring during long work sessions in daylight. The best choice depends on your environment and personal preference — you can switch back and forth whenever you want, and Outlook will remember your choice the next time you open it.

What happens when you change themes on multiple devices

If you use Outlook on your desktop computer, laptop, phone, and the web all with the same Microsoft account, your theme preference will sync across most of them. However, the sync is not always when ready — it can take a few minutes to an hour for the change to appear on all your devices. Desktop and web versions sometimes update at different speeds.

If you notice that one device is still showing the old theme after you changed it on another, wait a few minutes and then close and reopen Outlook on that device. If it still has not synced, you can manually change it on that device using the steps above — there is no harm in setting the theme separately on each device if you prefer different themes in different places.

Troubleshooting theme changes that do not appear

If you change your theme but the interface still looks the same, first check that you actually clicked the theme option and then confirmed the change. In Outlook on the web, make sure you clicked the theme button itself, not just hovered over it. In desktop Outlook, make sure you clicked OK to save your changes before closing the Options window.

If the change still does not show up, try closing the current message or folder view and opening a different one — sometimes the display does not refresh until you navigate somewhere else. If that does not work, close Outlook completely and reopen it. On the web, try clearing your browser cache or opening Outlook in a private or incognito window to rule out a caching issue. If the problem persists only on one device, that device may be out of sync with your account settings; signing out and back in usually fixes this.

Frequently Asked Questions

Does changing my Outlook theme affect how my emails look to other people?

No. The theme is only your view of Outlook — it does not change how your emails appear when you send them or how they look to the people who receive them. Your recipients see the email content the same way regardless of what color theme you use.

Can I use different themes on Outlook desktop and Outlook on the web at the same time?

Yes. Your theme preference syncs across devices, but if you manually change it on one device, that change will eventually sync to the others. If you want different themes on different devices, you can set them separately, though they may sync back to match after a few minutes or hours depending on your account settings.

Will dark mode make my Outlook emails harder to read?

No. Dark mode changes the background and menu colors, but the actual email content — the text you receive from others — remains readable. If an email was hard to read in light mode, it will still be hard to read in dark mode, because the problem is with how the sender formatted the email, not with your theme.

What if my Outlook version does not show a dark mode option?

Older versions of Outlook may not have a dark theme built in. If your version does not show theme options in Settings or Preferences, you are likely using an older release. You can check for updates through your Microsoft account or your computer's app store, or contact your IT department if Outlook is managed by your workplace.

Does dark mode work the same way on Outlook mobile apps?

Outlook on phones and tablets usually follows your device's system theme setting by default — if your phone is set to dark mode, Outlook will be dark. You can often override this in the Outlook app settings, but the exact steps vary between iPhone and Android. Check the app's Settings or Preferences menu for an Appearance or Theme option.