How to fix missing add-in in Outlook 2019, 2016, 2013, 2010 or Office 365

Follow the steps below to troubleshoot and fix a missing Outlook add-in.

If you have any questions about these instructions do not hesitate to contact us. Please include the following information:

  1. Version of Outlook you are using.
  2. Name and version of the add-in.
  3. Right after restarting Outlook, under which section of Outlook's Add-ins window is the add-in listed - Active, Inactive or Disabled (see instructions below).
  4. Any other details that you think are relevant.

Determine if the Add-in is Inactive or Disabled

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

    Click Ribbon File Tab

  • Click Options.

    Click Options

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

    Click Add-ins

  • The list of 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.

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...".

    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.

    Select Disabled Items

  2. Click Go.

    Click Go

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

    Select the Add-in to re-enable

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

    Click Enable

  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. Please see the first two sections of this article for a solution. IMPORTANT: you have to run scanpst repeatedly on every PST file, until it tells you that there are no more errors in the file.