To remove the Inpart for Outlook add-in installed from the Add-ins Store, you need to open the store window by clicking on the Get Add-ins button then you have to go to the My add-ins section.

1. To remove the Outlook add-in, click on the Get Add-ins button to go to the add-ins menu.
   
2. Go to My add-ins and search for the Inpart add-in.
   
3. On the Inpart box, click on the the More actions button (three dots icon) and then on Remove.
   

Removing the add-in for the desktop version also removes the add-in for the Web version, and vice versa.