Fix: This Add-in Could Not be Started Error in Outlook

Ensure your add-in has the requisite permissions to run

5 min. read

Updated onOctober 4, 2023

updated onOctober 4, 2023

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Key notes

Using Outlook means you have at your disposal some of thebest Office add-insthat make your work easier. However, these add-ins can sometimes malfunction and fail to start. For instance, users have been bombarded with theOutlook add-in error could not be startedmessage.

It could be a temporary glitch or a more serious issue. We take an in-depth look at what this error means and possible resolutions.

Why does we couldn’t start this add-in in Outlook error happen?

The add-in model is the feature that allowsOutlookto interact with third-party applications and services. There are many developers who have created these add-ins, so you can expect that they will experience issues from time to time.

It’s also important to note that this error is not docked on the Outlook app and can happen in other Office programs, such as Microsoft Word or Excel.

Auser on the Microsoft community platformhad this to say:

I can’t start any Office add-ins. All add-ins result inThis add-in could not be startederror. Add-ins are obtained from the Microsoft app-source site.

How do I fix the Outlook add-in error?

Attempt the following basic workarounds before any advanced technical solutions:

1. Start Outlook in Safe mode

2. Clear Outlook cache

Clearing the cache may help get rid of any corrupt files that are preventing the add-in from starting.

3. Repair Microsoft Office

If running repair does not work, you can try athird-party repair toolthat is more thorough in fixing such issues.

4. Reinstall the add-in

5. Reinstall Microsoft Office

And that’s how to fix the add-in could not be started error in Outlook. If none of these work for you, try using the web version of Outlook or switch toanother email client.

There you have it. If you found this article helpful or have any questions regarding Outlook, please leave a comment below, and we will do our best to address your query.

Fix: This Add-in Could Not be Started Error in Outlook#

Why does we couldn’t start this add-in in Outlook error happen?#

How do I fix the Outlook add-in error?#

1. Start Outlook in Safe mode#

2. Clear Outlook cache#

3. Repair Microsoft Office#

4. Reinstall the add-in#

5. Reinstall Microsoft Office#