When uninstalling the Outlook Plugin or document drop you may find that the normal steps taken to remove the necessary files will not work. Microsoft have made some system changes in windows 8 which will require a new method of removing these files.

Open Internet Explorer go to Tools -> Manage Add-ons -> Show: All add-ons:


All add ons view in IE

Right click the document drop or outlook add on and select more information:

Add on: more information

Highlight the file and select remove/disable.