Overview:

Some users may encounter persistent security warnings when using Microsoft 365 (M365) apps, such as Word, Excel, or Outlook. These warnings are typically triggered by third-party add-ins, with the PDF-XChange COM Add-in being a common culprit. Removing this add-in resolves the issue without affecting the core functionality of M365 applications.


Solution: Remove the PDF-XChange COM Add-in

Follow the steps below to remove the PDF-XChange COM Add-in and remove the security warnings.



1. Open the Affected M365 Application

  • Word, Excel, or PowerPoint, etc:

    • Launch the specific Microsoft 365 app where you are experiencing the security warning.

2. Access the Options Menu

  • In the top-left corner, click on File.
  • From the sidebar, select Options.

3. Navigate to Add-ins

  • In the Options window, select Add-ins from the menu on the left-hand side.

4. Manage COM Add-ins

  • At the bottom of the window, locate the Manage dropdown.
  • Make sure COM Add-ins is selected, and then click Go.

5. Remove PDF-XChange Add-in

  • In the COM Add-ins window, look for an entry called PDF-XChange.
  • Uncheck the box next to it to remove the add-in.
  • Click OK to apply the changes.

6. Restart the Application

  • Close and restart the affected Microsoft 365 app for the changes to take effect.

Additional Notes:

  • Removing the PDF-XChange COM Add-in should not affect your ability to open, view, or interact with PDF files in general. However, if you rely on specific functionality from this add-in, consider updating it or consulting with your IT team before removing it permanently.

  • If the security warning persists after removing the add-in, please contact the IT support team for further assistance.