Symantec Antivirus Outlook Protection Add In Error

Most of the Outlook email client users have encountered an Outlook protection add-in error associated with the Symantec software. Symantec is one of the security application created to provide protection for Windows computers. This security application provides full protection for the Outlook application and email service providers. Generally, Outlook will not create an error or issue. But, there is a chance for the Outlook application to freeze or crash if it configured with the Symantec application.

Symantec Antivirus Outlook Protection Add In Error
  • To fix this issue, it is better to disable all the Symantec add-ins to Outlook.
  • To do it, follow the instructions given below.
  • On your Windows computer, launch the Outlook application.
  • Click the File tab followed by the Options button.
  • Note: For Outlook 2007 users, click Tools > Trust Center.
  • Locate and click the Add-ins tab.
  • Choose the Exchange Client Extensions option from the Manage drop-down menu.
  • Tap the Go button.
  • Now, the list of plug-ins enabled with the Outlook application will appear on the screen.
  • Check for the label titled Symantec and disable the checkbox beside it.
  • Click the OK button followed by OK.
  • Restart the Outlook application on your Windows computer.
  • After the restart process, the error related to Outlook protection add-in will be resolved.

There is one more solution available to fix the Outlook protection add-in error caused due to the Symantec antivirus software. Most users have reported this issue when they have migrated from Symantec to some other antivirus application. So, this means that Symantec might not have been removed from the computer completely. The alternative solution to be followed to fix this issue is briefed below.

  • On your computer, go to the following location: C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Outlook\.
  • Now, located the extend.dat file and delete it.
  • This file will be recreated by Outlook later when it is launched.
  • Now, you should not be facing the Outlook protection add-in error.