How To Revert Back To Old Outlook – Classic Outlook Interface Reversion

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Switching back to the classic Outlook interface involves locating the toggle option hidden within the new version’s settings menu. If you’re wondering how to revert back to old outlook after the recent update, you’re not alone—many users find the new design confusing or slower for their workflow.

This guide walks you through every step, from finding the switch to troubleshooting common issues. We’ll cover desktop, web, and mobile versions so you can get your familiar layout back fast.

Why Users Want To Revert Back To Old Outlook

The new Outlook interface rolled out gradually, and not everyone loves it. Common complaints include:

  • Slower load times on older computers
  • Missing features like offline access or custom views
  • Cluttered navigation that buries frequently used buttons
  • Inconsistent behavior with third-party add-ins

Microsoft designed the new Outlook to unify the experience across Windows, Mac, and web. But if you prefer the classic look with its familiar ribbon and folder pane, reverting is straightforward.

How To Revert Back To Old Outlook On Windows Desktop

For Windows users, the toggle is built into the new Outlook app. Here’s the exact process:

  1. Open the new Outlook app (the one with the modern interface).
  2. Click the File tab in the top-left corner.
  3. Select Office Account from the left sidebar.
  4. Look for the About Outlook section.
  5. Click the Switch to Classic Outlook button.
  6. Confirm the prompt that appears.

If you don’t see the “Switch to Classic Outlook” button, your version might not support the toggle yet. In that case, try the registry method below.

Alternative Method Using Registry Editor

This method works when the toggle is missing. Proceed with caution—editing the registry can affect system stability.

  1. Press Windows + R, type regedit, and press Enter.
  2. Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
  3. Right-click in the right pane, select New > DWORD (32-bit) Value.
  4. Name it UseNewOutlook.
  5. Set the value to 0.
  6. Close Registry Editor and restart Outlook.

This forces Outlook to launch the classic version. To switch back to new Outlook later, change the value to 1 or delete the entry.

How To Revert Back To Old Outlook On Mac

Mac users have a similar toggle, but it’s located differently. Follow these steps:

  1. Open Outlook for Mac.
  2. Click Outlook in the menu bar (top-left).
  3. Select Preferences.
  4. Under Personal Settings, click General.
  5. Uncheck the box that says Use the new Outlook.
  6. Restart Outlook.

If the checkbox is grayed out, your organization may have enforced the new interface. Contact your IT admin to request the classic version.

What If The Toggle Disappears After An Update?

Microsoft sometimes removes the toggle in newer builds. If that happens:

  • Check for an update that might restore it.
  • Use the terminal command: defaults write com.microsoft.Outlook UseNewOutlook -bool false
  • Reinstall an older version of Outlook from your backup or company portal.

How To Revert Back To Old Outlook On The Web

The web version of Outlook (Outlook.com or Office 365) also has a toggle. Here’s how:

  1. Sign in to Outlook on the web.
  2. Click the Settings gear icon (top-right).
  3. Scroll down and click View all Outlook settings.
  4. Go to General > Appearance.
  5. Under Mail layout, select Classic.
  6. Click Save.

Note: The web version’s classic mode is simpler than the desktop classic. You won’t get the full ribbon, but the layout will resemble the older design.

Why The Web Toggle Might Be Missing

Some organizations disable the classic view for security or consistency. If you don’t see the option:

  • Contact your IT department.
  • Try using a different browser (Edge works best).
  • Clear your browser cache and cookies.

How To Revert Back To Old Outlook On Mobile

The Outlook mobile app doesn’t have a direct “revert” option. However, you can switch to the classic experience by:

  1. Open the Outlook app on iOS or Android.
  2. Tap your profile picture or initials (top-left).
  3. Select Settings.
  4. Scroll to Mail > Layout.
  5. Choose Classic under Conversation view.
  6. Disable Focused Inbox if you prefer the older sorting.

This doesn’t revert the entire interface, but it restores the classic reading pane and folder structure.

Limitations Of The Mobile Revert

Mobile apps update frequently, and Microsoft may remove the classic layout option. If that happens:

  • Use the web version on your phone’s browser.
  • Install an older version of the app from an APK store (Android only).
  • Provide feedback to Microsoft requesting the classic view.

Troubleshooting Common Issues When Reverting

Even after following the steps, you might encounter problems. Here are solutions for the most frequent issues:

Toggle Button Not Appearing

If the “Switch to Classic Outlook” button is missing:

  • Ensure you’re using the latest version of Outlook.
  • Check if your organization has disabled the toggle via Group Policy.
  • Try the registry method for Windows or terminal command for Mac.

Classic Outlook Keeps Switching Back

Some users report that Outlook automatically reverts to the new interface after a few days. To prevent this:

  • Disable automatic updates temporarily.
  • Set the registry key to 0 and make it read-only.
  • Block the new Outlook via Group Policy if you’re an admin.

Missing Features In Classic Outlook

Classic Outlook may lack some features from the new version, like integrated to-do or calendar insights. If you miss them:

  • Use the web version for those specific tasks.
  • Install the To-Do app separately.
  • Wait for Microsoft to add them to the classic version.

How To Revert Back To Old Outlook Permanently

If you want to ensure you never see the new interface again, take these steps:

  1. Follow the registry or terminal method above.
  2. Disable Outlook updates via File > Office Account > Update Options > Disable Updates.
  3. Block the new Outlook installation by deleting the OutlookNew folder in C:\Program Files\Microsoft Office\root\Office16.

Warning: Disabling updates leaves you vulnerable to security patches. Only do this if you have alternative protection.

Using Group Policy To Enforce Classic Outlook

IT admins can enforce classic Outlook across an organization:

  • Open Group Policy Management Editor.
  • Navigate to User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Other.
  • Enable Do not allow new Outlook.
  • Apply the policy and run gpupdate /force.

Frequently Asked Questions

Can I revert back to old outlook without losing my emails?

Yes, reverting only changes the interface. Your emails, folders, and settings remain intact. The toggle simply switches between UI versions.

How do I revert back to old outlook if the toggle is grayed out?

A grayed toggle usually means your IT admin has locked the setting. Contact them to request the classic version, or use the registry method if you have local admin rights.

Will reverting back to old outlook affect my add-ins?

Classic Outlook supports most add-ins, but some newer ones may only work in the new interface. Check with your add-in provider for compatibility.

How long will the old outlook version be supported?

Microsoft plans to support classic Outlook until at least 2029 for enterprise users. Consumer versions may lose support earlier, but you can still use the registry hack.

Is there a way to revert back to old outlook on multiple computers?

Yes, use Group Policy for networked computers, or deploy a script that sets the registry key to 0 on each machine. This saves time for IT admins.

Final Tips For A Smooth Revert

Before you start the process, back up your Outlook data file (.pst or .ost). This protects you if something goes wrong during the switch.

Test the classic interface for a few days before disabling updates. Some users find that the new Outlook grows on them after adjusting settings like the ribbon layout or dark mode.

If you still prefer the classic version, the methods above will keep you there. Remember that Microsoft may eventually force the new interface, so stay informed about updates and workarounds.

Reverting back to old outlook is a simple process once you know where to look. Whether you’re on Windows, Mac, web, or mobile, the steps are consistent and reversible. If you encounter any issues, the troubleshooting section above should help you resolve them quickly.