I recently installed a Dymo Label printer on a Terminal Server.  There were no options during the installer, so addins were installed into Word, Excel and Outlook.  I used Group Policy Preferences to remove them.  To remove them, the following registry keys need to be deleted:

HKCUsoftwaremicrosoftofficewordaddinsdymo.labelwriteraddin
HKCUsoftwaremicrosoftofficeoutlookaddinsdymo.labelwriteraddin
HKCUsoftwaremicrosoftofficeexceladdinsdymo.labelwriteraddin