Software⏱️ 4 min read📅 2026-06-11

How to Fix: Outlook fails to open with error: 'Microsoft Outlook' exited without properly closing your Outlook data file

Outlook fails to open with error: 'Microsoft Outlook' exited without properly closing your Outlook data file. Restarting the application may resolve the issue.

Quick Answer: Restart Microsoft Outlook and try launching it again.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

The 'Microsoft Outlook' exited without properly closing your Outlook data file error occurs when you forcefully shut down Outlook and then attempt to restart it. This issue affects users of Microsoft Outlook who experience difficulties in launching their application.

This error can be frustrating, especially if you have important emails or tasks that you need to access urgently. In this troubleshooting guide, we will walk you through the steps to resolve this issue and get your Outlook up and running smoothly.

💡 Why You Are Getting This Error

  • The primary reason for this error is when you forcefully shut down Outlook without properly closing its data file. This can happen if you need to restart your computer or experience a system crash. When you force-quit Outlook, it may not fully close the application, leaving behind an incomplete data file.
  • Alternatively, some users have reported that they are experiencing this error after updating their Outlook version or installing new add-ins. In such cases, the issue might be related to the update or add-in causing a conflict with the existing data file.

✅ Best Solutions to Fix It

Restarting Outlook in Safe Mode

  1. Step 1: To start troubleshooting, try restarting Outlook in safe mode. To do this, follow these steps:
  2. Step 2: 1. Open the Start menu and type 'msoutl.exe /safe' (without quotes) in the search bar.
  3. Step 3: 2. Press Enter to open the Command Prompt window.
  4. Step 4: 3. Navigate to the location where your Outlook executable is located (usually C:\Program Files\Microsoft Office\root\Office16\MSOUTL.EXE).
  5. Step 5: 4. Type 'msoutl.exe /safe' and press Enter to start Outlook in safe mode.

Manually Closing the Data File

  1. Step 1: Another method to resolve this issue is to manually close the Outlook data file. To do this, follow these steps:
  2. Step 2: 1. Locate the .pst or .ost file associated with your Outlook profile (usually found in C:\Users\YourUsername\AppData\Local\Microsoft\Outlook).
  3. Step 3: 2. Close all instances of Outlook and any other applications that may be running in the background.
  4. Step 4: 3. Press the Windows key + R to open the Run dialog box.
  5. Step 5: 4. Type 'taskkill /im outlook.exe' (without quotes) and press Enter to terminate the Outlook process.
  6. Step 6: 5. Navigate to the location of your .pst or .ost file and delete it using a file explorer or command prompt.

💡 Conclusion

If you have followed these steps and are still experiencing issues with Outlook, we recommend contacting Microsoft support for further assistance. They can help diagnose the issue and provide additional guidance on resolving the problem.

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