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Users should not be able to install Office add-ins in the Outlook client or Outlook on the web. By default, it’s enabled, and as a company policy, it should prevent users from installing Office add-ins. In this article, you will learn how to disable access to install Office add-ins.

Install Office add-ins

Users can install Office add-ins in their Outlook client and through Outlook on the web by default. Let’s have a look at the scenarios.

How to install Office add-ins in Outlook client

  1. Start the Outlook client.
  2. Click on the Browse Add-ins button in the ribbon.
Disable access to install Office add-ins browse add-ins
  1. Click on All and find the add-in that you want to install.
  2. Click Add.
Add office add-in
  1. Click on My add-ins and verify that the add-in appears.
Disable access to install Office add-ins my add-ins

How to install Office add-in in Outlook on the web

  1. Sign in to Outlook on the web.
  2. Click on the … (dots) in the ribbon.
  3. Select Get add-ins.
Disable access to install Office add-ins get add-ins
  1. Click on All and find the add-in that you want to install.
  2. Click Add.
Disable access to install Office add-ins add
  1. Click on My add-ins and verify that the add-in appears.
Disable access to install Office add-ins my add-ins

How to install add-ins from Office Store

  1. Go to the Office Store.
  2. Find the add-in that you want to install.
  3. Click on Get it now.
Disable access to install Office add-ins get it now
  1. A message appears that the add-in is successfully added to the account.
Office add-in successfully added

Office add-ins are in sync

It doesn’t matter where you install the Office add-ins from, they are synced to your Microsoft 365 account, and they will appear both in the Outlook client and Outlook on the web.

In the below example, all three add-ins appear in the Outlook client.

Office add-ins

How to disable access to install Office add-ins in Microsoft 365

To disable users from installing Office add-ins, follow these steps:

  1. Sign in to Exchange admin center
  2. Click on Roles > User Roles
  3. Select Default Role Assignment Policy
Disable access to install Office add-ins Default Role Assignment Policy
  1. Click on Manage permissions.
  1. Uncheck the below three roles:
  • My Custom Apps
  • My Marketplace Apps
  • My ReadWriteMailbox Apps
  1. Click on Save changes.
Disable access to install Office add-ins other roles

Verify access disabled to install Office add-ins

Go through all the scenarios and verify access to install Office add-ins is disabled.

Note: It’s important to know that you need to wait 10 minutes before you start testing the change.

Restart the Outlook client and click to install an Office add-in.

The message appears:

Unfortunately, your organisation has disabled access to this add-in. Please contact your administrator to request access.

Disable access to install Office add-ins disabled access in Outlook client

Refresh Outlook on the web and click to install an Office add-in.

The message appears:

Sorry, we can’t complete this operation right now. Please try again later.

Disable access to install Office add-ins disabled in Outlook on the web

Go to the Office Store and click to install an Office add-in.

The message appears:

Installation failed.

Disable access to install Office add-ins installation failed in Office Store

That’s it!

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