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How to install Microsoft Add-in in the admin center?

Learn how to deploy the add-in

Yara | NEWOLDSTAMP avatar
Written by Yara | NEWOLDSTAMP
Updated over a week ago

As an admin, you can install the Office add-ins to users in your organization through the Centralized Deployment feature available in the Microsoft 365 admin center. Centralized Deployment is the recommended and most feature-rich way for most admins to deploy add-ins to users and groups within an organization.

To install an add-in in the admin center, follow these steps:

  1. In the admin center, go to Settings > Integrated apps > Add-ins page. If you don't see this option, go to the Settings > Add-ins page instead.

2. Click Deploy Add-in at the top of the page and then click Next.

3. Click Upload custom apps.

4. Download manifest.xml from, choose this file in the next step and select Upload.

5. On the next page, select Everyone, Specific users/groups, or Just me to specify who the add-in should be deployed to. Use the Search box to find specific users or groups.

If you install the add-in to just yourself, you can select Change who has access to add-in later to install it to more users.

Note: Only users with installed Add-in will have signatures applied to emails after deployment.

6. A green tick will appear once the add-in is deployed.

Note: Microsoft 365 can take up to 48 hours to process Outlook add-ins, and you may need to relaunch the Outlook app.

The required version:


Outlook version

Supported version and later


- Microsoft 365 subscription
- retail perpetual Outlook 2016 and later
Note: Retail versions only!
(for now, volume-licensed versions don't include the necessary API requirements sets)

from Version 2104, build 13929.20296 or above


- new UI
Note: Only the New Outlook interface is supported
(go to Outlook > New Outlook to enable it)

from Outlook
Version 16.38.506

Web browser

- Modern Outlook UI when connected to Exchange Online:


Note: If you have an Office 2021 LTSC or any other oldest Office with an old Outlook version, please update them to the newest version specified above.

Also, you can check the Microsoft article Outlook JavaScript API requirement sets for more details.

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