How to Fix Missing Integration in Outlook 2016, 2013 or 2010

This section addresses where to look and what to do if the Thru for Microsoft Outlook add-in isn't appearing in Outlook.

Determine if the Thru Add-In is Inactive or Disabled

1. Click on the File tab in the upper-left corner of the main Outlook window.
   

   

   
   
   
2. Click Options.
   

   

   
   
   
3. Click Add-ins in the left column of the next window
   

   

   
   
   
4. The list of Outlook add-ins is separated into three sections – Active, Inactive and Disabled.
   The exact steps you need to take are different, based on the section in which the add-in is listed.
   Please carefully follow the instructions below.
   
   1. If the add-in is not listed in any of the three sections, close Microsoft Outlook and then reinstall the Thru for Outlook add-in and restart Outlook. If you still do not see it, go back to the beginning of this guide.
   2. If the add-in is listed in the Inactive section, continue to Enable Inactive Add-In.
   3. If the add-in is listed in the Disabled section, continue to Enabled Disabled Add-In.

Enable Inactive Add-In

1. If the add-in is listed under Inactive, make sure "COM Add-ins" is selected in the Manage drop-down and click "Go…".
   

   

   
   
   
2. Check the checkbox next to the Add-in and click "OK".
3. Restart Outlook. Close Outlook, wait for 5 seconds, then start it again.

Enable Disabled Add-In

1. Select Disabled Items in the drop-down at the bottom of this window, next to the Go button.
   

   

   
   
   
2. Click Go.
   

   

   
   
3. Select the Add-in which you would like to re-enable.
   

   

   
   
4. Click Enable in the lower-left corner of this window.
   

   

   
   
   

Restart Outlook. Close Outlook, wait for 5 seconds, then start it again.

Note: If an add-in is getting disabled frequently, it is likely that your Outlook data file (PST or OST) is getting corrupted. It is a very common Outlook issue.