title: change default icon outlook-addin
body: <p>I try to change the defaut icon of y outlook add-in. By defaut it's blue icon <a href="https://i.stack.imgur.com/d3esK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d3esK.png" alt="defaut icon"></a></p>
  
  <p>I changed every logo in my images folder. When I would like add my add-in I see the correct logo <a href="https://i.stack.imgur.com/cnfS0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/cnfS0.png" alt="enter image description here"></a></p>
  
  <p>But on Outlook, I have again the old logo [<img src="https://i.stack.imgur.com/JFwMy.png" alt="enter image description here">]</p>
  
  <p><a href="https://i.stack.imgur.com/JFwMy.png" rel="nofollow noreferrer">3</a> 
  I tried to clean and rebuild the solution, but it didn't change anything. I don't understand why I have always the old logo. I don't know where this old logo come from</p>