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What are Outlook "add-ins"?

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› How to › What are Outlook “add-ins”?

Last reviewed on April 13, 2015     4 Comments

Add-ins are programs that you install and use with Outlook to "extend" Outlook's capabilities.

To view the list of add-ins installed in Outlook 2013 and Outlook 2016, go to File, Options, Add-ins.
Outlook 2013 - 2016 Addins doalig

In Outlook 2010, go to File, Options, Trust Center, Trust Center Settings, Add-ins. In Outlook 2007, add-ins are listed in the Trust Center, accessed through the Tools menu.

Addins dialog in Outlook 2010

In Outlook 2007 and older, you'll find most add-ins under COM Add-ins, while a few may be listed under Exchange Client Extensions.

Note that Exchange client Extensions are not supported in Microsoft Outlook 2010 and up.

Com add-ins dialog

To enable or disable add-ins, click the Go button and add or remove the checkmark in front of the add-in name. Click Ok to save the changes and return to Outlook.

Enable or disable add-ins

To check for disabled add-ins, select Disabled Items from the dropdown and click Go. Click on each add-in that you want to enable then click the Enable button.

disabled addins

Outlook 2003 and older

In Outlook 2003 and older, the Add-ins dialog is at Tools, Options, Other tab, Advanced Options button.

Options dialog in Outlook 2003 and older

What are Outlook "add-ins"? was last modified: April 13th, 2015 by Diane Poremsky

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About Diane Poremsky

A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

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Mike
November 20, 2019 6:21 pm

In my W10 Outlook keeps Synchronising Inbox and I cannot receive emails on my desktop. However, I can receive them via my laptop. I can still send emails from the desktop. I checked via the manage COM Add-ins in the Outlook Options and the following show up. Anti Virus Add-in followed by the tab which says Always enable this add-in and the next is Outlook Social Connector and the tab says Disable this add-in. Is the problem here? If so how do I fix this?

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Diane Poremsky
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Reply to  Mike
November 21, 2019 9:20 am

That is the slow and disabled page? Go to File > Options > Addins - both should probably be in the disabled section.

You may need to remove the account from the profile or make a new profile.

What type of email account do you have configured in Outlook? POP, IMAP, Outlook.com, or Microsoft Exchange?

Does it sync in Safe mode? To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.

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Tom
June 15, 2016 3:37 am

Hi Diane

I have recently been frustrated that a COM addin has continually been experiencing 'not loaded. a runtime error occurred during the loading of the com add-in outlook 2013'. I have attempted to alter the value in the Registry Editor to 3 but it keeps reverting to 2.

Are you aware of this kind of behaviour or do you have any ideas to rectify?

Thanks!
Tom

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Diane Poremsky
Author
Reply to  Tom
June 15, 2016 9:23 am

what addin is it and did it ever work with Outlook 2013?

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