How To Removing An Add-On In Outlook That No Longer Exists

If you recently deleted or removed your Anti-virus Software from your system. Or if you upgraded your anti-virus to an earlier version, then you may face this situation on opening your office outlook.

Outlok still tries to launch the removed (anti-virus) add-in and displays the error: 

"The add-in " abc* Exchange Extension" (file name [abc*xch32.dll] / location) cannot be loaded and has been disabled by  Outlook etc etc.," 

The Add-in "Symantec Antivirus 10.1" (C:\Program Files\Symantec Antivirus\vpmsece4.dll) cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in

* can be avg or symantec or what ever you previously installed and then removed.

even if you delete any information related to that software from the registry wont clear this error. Outlook Will still display the error.. ok, how to remove this error?

Well, if you are using any version prior ro outlook 2007, follow this step.

In Outlook, go to Tools - Options - Other - Advanced Options
Click on Add-In Manager. Uncheck the add-in that you are not currently using or the one outlook cant load.

And if you are using Office Outlook 2007 or 2010, then follow this step. Just delete  "extend.dat" that will be located in your outlook mail folder. Normally, 

For Windows XP:

C:>Documents and Settings>User Name>Local Settings>Application Data>Microsoft>Outlook and then delete extend.dat 

For Windows Vista And Windows 7:
C:>Users>User Name>Local Settings>Application Data>Microsoft>Outlook and then delete extend.dat.

If you are not sure where your oulook data files are stored. The simplest way to find the folder is, open outlook 2007 - Tools - Account Settings - Data Files - Open Folder. (refer screen shot below)

Delete the file extend.dat

Job done, now restart your outlook and you wont get that error message.