
To run the utility, first, CLOSE Outlook!
Go to the Control Panel and launch Run Advertised Programs. Select Symantec AV Plugin Utility and click Run.

You should see the following message window open:

Click OK and after a moment another message window will appear:

Click Yes to allow the utility to delete the Extend.dat file.
You should now be able to reopen Outlook error free.
If there are multiple users on the workstation, each user may need to run the utility.
Additional information is available on Symantec's website. See "Symantec AntiVirus: Microsoft Outlook error...."
If you have problems or continue to see the error message, contact the JMU Computing HelpDesk at 568-3555 or helpdesk@jmu.edu for further assistance.