How to Install & Revert to Old Outlook on Windows 11 (2026)

If you’ve recently updated your system or toggled a switch and suddenly found yourself staring at the “New Outlook” (which feels a lot like the web version), you aren’t alone.

Many users prefer the classic desktop version for its robust offline capabilities, support for COM add-ins, and familiar interface.

Here is the definitive guide on how to install and revert to the Old (Classic) Outlook in Windows 11.

Why Switch Back to Classic Outlook?

While the New Outlook is streamlined, it currently lacks several “power user” features found in the classic version:

• PST File Support: Classic Outlook allows for local data archiving.

• Offline Access: The new version has limited functionality without an internet connection.

• VBA and Add-ins: Many business plugins only work on the classic desktop architecture.

• Multi-window Management: The classic version handles multiple open emails more traditionally.

Method 1: The “New Outlook” Toggle (The Easiest Way)

If you are currently inside the New Outlook application, Microsoft has provided a built-in “escape hatch.”

1. Open the New Outlook app.

2. Look at the top-right corner of the window.

3. Locate the toggle switch labeled New Outlook.

4. Click the toggle to turn it Off.

5. A feedback prompt may appear asking why you are switching; you can skip this or provide details.

6. The app will close automatically and launch the Classic Outlook version.

Method 2: Launching via the Executable Command

Sometimes the “New” app hides the shortcut to the old one. You can force Windows to run the classic executable directly.

1. Press Windows Key + R on your keyboard to open the Run dialog.

2. Type the following command:

   outlook.exe

3. Press Enter.

4. If Classic Outlook is still installed on your system, it will launch immediately. Right-click the icon on your taskbar and select Pin to taskbar to ensure you don’t lose it again.

Method 3: Reinstalling via Microsoft 365 / Office

If you cannot find the classic version anywhere, it may have been uninstalled or suppressed during a Windows update.

1. Go to Office.com and sign in with your Microsoft account.

2. Click Install Apps in the top right corner.

3. Select Microsoft 365 Apps.

4. Run the setup file. This will install the full desktop suite, including the Classic Outlook (Desktop) application.

5. Once installed, search your Start menu for “Outlook.” Look for the icon that does not have the “Pre” or “New” badge on it.

Method 4: The Registry Editor Fix (Advanced)

If Windows keeps forcing you back into the New Outlook every time you try to open the old one, you can use a registry tweak to stop the redirection.

Note: Always back up your registry before making changes.

1. Press Windows Key + R, type regedit, and hit Enter.

2. Navigate to the following path:

   HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General

3. On the right side, look for a DWORD value named VersionToRestore.

4. If it doesn’t exist, right-click > New > DWORD (32-bit) Value and name it VersionToRestore.

5. Double-click it and set the value to the current version number (or simply delete the UseNewOutlook key if it exists in the Preferences folder).

6. Restart Outlook.

Troubleshooting: What if “New Outlook” keeps opening?

If the toggle is missing and the registry fix feels too daunting, check your Start Menu.

• Windows 11 often lists two apps: “Outlook” (Classic) and “Outlook (New)”.

• Uninstall the New version: Right-click “Outlook (New)” in the Start menu and select Uninstall. This often forces the system to default back to the classic version when opening mail links.

Summary Table: Classic vs. New Outlook

Conclusion

Returning to the Classic Outlook in Windows 11 is a move often driven by the need for reliability, advanced data management, and the familiar workflow that “New Outlook” currently lacks. While Microsoft continues to push its web-based architecture, the classic version remains the gold standard for power users who rely on offline access, PST archiving, and specialized COM add-ins.

By using the methods outlined above—whether it’s a simple toggle switch or a quick registry adjustment—you can reclaim your preferred email environment. Remember that keeping the classic version pinned to your taskbar is the best way to prevent Windows from defaulting back to the preview version during future updates.

As Windows 11 evolves, the “New Outlook” will likely gain more features, but for now, the classic desktop app is still the most robust tool for professional communication.