January 07, 2009
If you see this message...

Some of you may be seeing the following message when you start up Outlook:

'The Add-in "Outlook Scan" (C:Program Files\McAfee\VirusScan Enterprise\Scanotlk.dll) cannot be loaded and has been disabled by Outlook. Pelase contact the Add-in manufacturer for an update..."

The fix for this is as follows (assuming you are using Outlook 2007):

  1. Under the Tools menu, go to Trust Center, Add-ins
  2. Choose 'Exchange client extensions' from the drop-down list labelled 'Manage' near the bottom of the screen.
  3. You should see 'Outlook Scan' listed twice. Unclick the first one. Click OK.
  4. Close Outlook
  5. Restart Outlook to verify that the error no longer occurs

If you have problems or questions, you can call the EIT hotline at 515.294.1725.

If you're interested in why this might be happening, here's a brief explanation. Yesterday, we made available an update to McAfee VirusScan, which downloads automatically to your computer. For some people, this created a conflict between an older version of the Outlook Scan plug-in and the new version. Unclicking the first Outlook Scan in the instructions above, removes this conflict and eliminates the error message.

I should add that this has affected very few people, but wanted to get the information out there for those who are seeing it.

ETA (Edited to Add): Some people have reported that although they see the above error message, they only find one 'Outlook Scan' listed under 'Exchange client extensions.' In that case the solution is as follows:

If you are running Windows Vista:

  1. Close Outlook
  2. Open the Start menu, Click on 'Computer'
  3. In the address bar of the window that opens up, type in C:\users\username\appdata\local\microsoft\outlook
  4. In the list of files, find and delete 'extend.dat'
  5. Close the Computer window
  6. Start Outlook, confirm the error no longer occurs.

If you're running Windows XP look in C:\documents and settings\username\local settings\application data\microsoft\outlook instead. Otherwise the instructions should be the same.

Posted by dcoates at January 07, 2009 09:18 AM