You may have opened Outlook and found a redesigned interface you did not expect. This is the new Outlook for Windows, which is being rolled out as an update. This article explains the difference between the two versions and provides clear steps to switch back. You will learn how to return to the classic Outlook interface you are familiar with.
Key Takeaways: Switching Back to Classic Outlook
- Toggle switch in the top-right corner: This is the fastest method to revert if the option is available in your new Outlook window.
- Windows Settings > Apps > Installed apps: Use this path to repair or reset the Outlook application if the toggle is missing.
- Microsoft 365 Apps admin center: An administrator can prevent the new Outlook from deploying to your organization’s devices.
Understanding the New Outlook for Windows
The new Outlook for Windows is a major update that replaces the traditional desktop application. It is built on a shared codebase with Outlook on the web. Microsoft is offering it as a free update for users of the classic Outlook app included with Microsoft 365.
This version features a simplified interface and integrates with other Microsoft services like Loop and To Do. It requires an active internet connection for most core functions. The classic Outlook is a fully-featured desktop program known as Outlook Desktop. It can work offline and supports all advanced features like PST files and COM add-ins.
Why You Might Want to Revert
You might prefer the classic version for specific business needs. It supports local data files and complex rules that the new version may not handle. Some third-party add-ins and macros only work with the desktop application. The familiar ribbon interface and deeper customization options are also key reasons to switch back.
Steps to Switch Back to Classic Outlook
The primary method uses a toggle switch within the application. If that switch is not visible, you will need to use system settings to restore the classic version.
Method 1: Using the Toggle Switch
- Open the new Outlook app
Launch the new Outlook for Windows from your Start menu or taskbar. - Find the toggle switch
Look in the top-right corner of the window, next to the feedback icon. You should see a toggle switch labeled “Try the new Outlook” or similar. - Turn off the toggle
Click the toggle to turn it off. A confirmation dialog will appear asking if you want to switch back. - Confirm the action
Click “Switch back” in the dialog box. The new Outlook will close, and your classic Outlook desktop app will open automatically.
Method 2: When the Toggle is Missing
If the toggle switch is not present, the new Outlook may have been installed as a separate application. You need to repair or reset the classic Outlook app.
- Open Windows Settings
Press the Windows key + I on your keyboard to open the Settings app. - Navigate to Apps
Click on “Apps” in the left sidebar, then select “Installed apps” from the main panel. - Find Microsoft Office
In the search bar, type “Microsoft Office”. Locate your Microsoft 365 installation in the list. - Select Modify
Click the three-dot menu next to the entry and choose “Modify”. If using a perpetual license, look for “Microsoft Outlook” instead. - Choose Online Repair
In the window that opens, select “Online Repair” and click “Repair”. This process will restore the original Office applications, including classic Outlook.
If the Switch Back Option Does Not Work
Sometimes the revert process can fail or the classic app does not launch correctly. Here are specific issues and how to resolve them.
Classic Outlook Opens but Immediately Switches Back to New Outlook
This happens when a group policy or registry setting forces the new Outlook. Check with your IT department if a policy is enabled. For a personal device, you can check the registry key at HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options. A DWORD value named “PreferOutlookLook” set to 1 enables the new version. Setting it to 0 may revert the behavior.
The Toggle Switch is Completely Gone
Your organization may have enrolled your device in a controlled rollout. You cannot revert individually in this case. Contact your IT support team to request being moved back to the classic version. They can adjust the deployment policy in the Microsoft 365 admin center.
You See an Error Message During Repair
If the Online Repair fails, you may need to uninstall and reinstall Office. First, back up your Outlook data files. Use the official Microsoft Support and Recovery Assistant tool to completely uninstall Office. Then, reinstall it from office.com. This will give you a clean installation of the classic Outlook application.
New Outlook vs Classic Outlook: Key Differences
| Item | New Outlook for Windows | Classic Outlook Desktop |
|---|---|---|
| Core Technology | Web-based (Outlook on the web) | Native Windows desktop app |
| Offline Access | Limited, requires internet for most tasks | Full functionality without a connection |
| Data Files | Does not support local PST files | Full support for PST and OST files |
| Add-in Support | Limited to web add-ins | Supports COM and VSTO add-ins |
| Interface | Simplified, modern design | Traditional ribbon interface |
| Deployment | Automatic update via Microsoft | Installed via Office setup or MSI |
You can now return to the classic Outlook interface using the toggle switch or system repair. For persistent issues, check for administrative policies that enforce the new version. Explore the classic app’s advanced options like Rules and Alerts to automate your email management. Press Alt + F to quickly access the File menu for account settings and import tools.