If you want to prevent end users from installing add-ins for Outlook on all Outlook clients, make the following changes to roles in the Exchange admin center:
There are a couple of common scenarios that Exchange administrators manage in their organizations. Common administrative tasks with add-ins for Outlook For more information, see Manage user access to add-ins for Outlook. If required, you can limit availability of an add-in to specific users in your organization.
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To install add-ins for some or all users in your organization, see Install or remove add-ins for Outlook for your organization. For more details, see Specify the administrators and users who can install and manage add-ins for Outlook. To disable users from installing add-ins from the Office Store, remove the My Marketplace Apps role from them. To prevent users from installing an add-in that isn't from the Office Store, remove the My Custom Apps role from them. It is also possible to assign users to a role that allows them to install add-ins for your organization or for a subset of users in your organization. Administrators can also disable users from installing Office Store add-ins, and from installing add-ins on behalf of other users. Administrators can disable users from installing add-ins that are not downloaded from the Office Store (instead they are "side loaded" from a file or URL). Exchange administrators have a number of controls available for managing add-ins and users' access to them. Add-in access and installationīy default, all users can install and remove add-ins. For example, German postal addresses in the message body won't activate the Bing Maps add-in. Default add-ins for Outlook only activate on English language content. Some add-ins for Outlook are installed by default.