Read time 4 minutes

Summary: We explore common causes and provide troubleshooting steps, including enabling disabled add-ins and updating outdated ones. For persistent issues, consider Kernel for Outlook PST Repair, a robust tool that can efficiently address add-in problems, ensuring a seamless Outlook experience.

Microsoft Outlook is a versatile email client known for its numerous features and the ability to integrate third-party add-ins, which enhance productivity and streamline various tasks. These add-ins can be invaluable tools for tasks like email tracking, time management, and document management. However, sometimes users encounter a common issue where add-ins mysteriously go missing from their Outlook application. This can be frustrating, but fear not, as we’ll delve into a comprehensive guide on how to fix missing add-ins in Outlook 2016, 2013, or 2010.

Understanding Outlook Add-ins

Understanding Outlook Add-ins:

Before we delve into the troubleshooting steps, let’s first understand what Outlook add-ins are and why they are essential.

Outlook add-ins are third-party extensions or plugins that can be integrated into your Outlook application to extend its functionality. These add-ins serve various purposes, such as email tracking, contact management, task management, calendar synchronization, and more. They are designed to enhance your productivity, automate tasks, and improve your overall Outlook experience.

Outlook supports different types of add-ins, including COM Add-ins, VSTO Add-ins, and Web Add-ins. These add-ins are developed by third-party software vendors or custom-built for specific organizational needs.

Common Reasons for Missing Add-ins:
  1. Disabled Add-ins
  2. Outdated Add-ins
  3. COM Add-ins Conflict
  4. Administrative Policies
  5. Corrupted Outlook Profile

Troubleshooting Missing Add-ins:

Method 1: Check Disabled Add-ins
  1. Open Outlook.
  2. Go to the “File” tab.
  3. Select “Options.”
  4. In the Outlook Options window, click on “Add-Ins.”
  5. In the Manage box, select “Disabled Items” and click “Go…”
  6. If you find any disabled add-ins, select them and click “Enable.”

This simple step can often resolve the issue if the add-ins were mistakenly disabled.

Method 2: Enable Inactive Add-ins
  1. Go to “File” and select “Options.”
  2. Click on “Add-Ins.”
  3. In the Manage box, select “COM Add-ins” and click “Go…”
  4. Check the box next to the add-ins you want to enable and click “OK.”
Method 3: Update Outdated Add-ins
  1. Visit the website of the add-in’s developer and check for updates.
  2. Download and install the latest version of the add-in, which is compatible with your Outlook version.
  3. Restart Outlook to see if the add-in reappears.
Method 4: Check for COM Add-in Conflicts
  1. Navigate to “File” > “Options” > “Add-Ins.”
  2. In the Manage box, select “COM Add-ins” and click “Go…”
  3. Uncheck all add-ins and click “OK.”
  4. Restart Outlook to check if the add-ins appear.
  5. If they do, you can re-enable the add-ins one by one to identify the conflicting one.
Method 5: Admin Policies (For Enterprise Users)

If you’re in an enterprise environment, the missing add-ins issue might be due to administrator-enforced policies. Contact your IT department or system administrator to inquire about the policies and whether they can adjust them to enable your desired add-ins.

Method 6: Repair Outlook Profile
  1. Close Outlook.
  2. Go to the Windows Control Panel.
  3. Find and open “Mail” (or “Mail and Fax” in older Windows versions).
  4. Click “Show Profiles.”
  5. Select your Outlook profile and click “Properties.”
  6. Click “Data Files.”
  7. Highlight your mailbox and click “Settings.”
  8. Go to the “General” tab and click “Compact Now.”
  9. Click “OK” to save your settings.
  10. Restart Outlook to check if your add-ins have reappeared.
Method 7: Reinstall Add-ins

If none of the above methods work, you might need to reinstall your add-ins. Uninstall the add-ins from your computer, download the latest versions from the developers’ websites, and install them again.


Outlook add-ins are valuable tools for enhancing productivity and efficiency. When they go missing, it can be frustrating, but with the troubleshooting methods outlined above, you can often resolve the issue. However, if you encounter persistent add-in problems, consider using the Kernel for Outlook PST Repair tool, a powerful solution that can efficiently address add-in issues and ensure a seamless Outlook experience.

Kernel for Outlook PST Repair