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.


  5. 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.