Software & Apps MS Office How to Uninstall a Disabled Outlook Add-On Share Pin Email Print Microsoft MS Office Outlook Word Excel Powerpoint By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated February 03, 2020 "The add-on cannot be loaded and has been disabled by Outlook" Outlook is firm about its disabling that add-in of which, it seems, you should rid yourself. You've tried, of course, uninstalling the application behind the Outlook extension — but to no avail. Outlook isn't much help in letting you know where to uninstall the disabled add-on either or any add-in for that matter. Fortunately, it is but a short tour with a somewhat unexpected twist that takes you to the place where add-ons reside in Outlook. Trust it. 7 Steps to Uninstall a Disabled Outlook Add-On To completely remove a plug-in from Outlook: Select Tools | Trust Center... from the menu in Outlook.Go to the Add-ons category.Select either COM Add-ins or Exchange Client Extensions, depending on the type of add-in you want to remove under Manage.You can see each extension's type in the Type column.Click Go....If the add-on you want to remove is a COM add-in:Highlight the extension you want to delete.Click Remove.If the add-on you want to delete is an Exchange client extension:Make sure the add-in you want to remove is not checked in the list.Click OK. Screen-by-Screen: Uninstalling a Disabled Outlook Add-On Uninstalling the Disabled Add-On Screenshot Walkthrough 6 Steps if Outlook Can't Find The Disables Add-On is Somewhere? If Outlook complains about an extension you can find in none of the add-in manager's lists, you can try deleting Outlook's add-in cache: Make sure Outlook is not running.Press Windows-R.Type "%localappdata%\Microsoft\Outlook" (not including the quotation marks).Using Windows 2000 or XP, use "%appdata%\Microsoft\Outlook" instead.Click OK.Highlight the "extend.dat" file.Press Del. Screen-by-Screen: Finding the Disabled Outlook Add-On Finding the add-on with a screenshot walkthrough If Nothing is Working Should you run into more problems starting Outlook now than you had before, restore "extend.dat" from the trash. You can select Edit | Undo Delete right in the Explorer window in which you trashed the file.