Re-enabling a disabled add-in

Here are the steps to enable a disabled plugin on Outlook 2013/2016:

1. Click on File > Info > and select "Slow and Disabled add-ins":

   Open

   

    

2. Enable Redmine for Outlook:
   Click on Enable this add-in.
   
   

   Button Enable will change to Disable, the add-in will be loaded.
   
   

   Here are the steps to enable a disabled plugin on Outlook 2010:

   Click on the "File" tab in your navigation and Click Add-in:

   Open

   

   Click on Enable this add-in.
   
   

   Button Enable will change to Disable, the add-in will be loaded.