The Outlook Add-in can be installed for all of your users or specific groups of users using the Office 365 Admin Centre. This is the recommended method of installing the Outlook Add-in as it saves time as the Add-in can be deployed en masse, rather than installing it on a per user basis. Once configured you can then add or remove users from these groups to install or uninstall the add-in on their behalf. 

Once you are in the Admin Centre, click 'Show all' on the left hand toolbar:

 

Expand the 'Settings' section and click on 'Add-ins':

On the resulting screen, select the 'Deploy Add-in' button:

 

This will open a new dialogue box explaining how centralised deployment works. Once on this screen click Next.

You will now be presented with three options of how you would like to deploy the WESS Add-in, you will need to choose ‘I have a URL for the manifest file’ and then enter https://wess.invisible.io/api/private/mailapp/manifest

This will now allow you to start configuring which Users have access to the WESS Add-in. You will be able to choose from Everyone, Specific users/groups or Just me. 

Selecting Specific users/groups will create a new dropdown menu that will allow you to search for the users or groups required. Selecting the user or group will add them to the list for deployment, allowing you to select multiple users or groups.

Once you have finalised who to deploy the Add-in, press the Deploy now button at the bottom of the page. The Add-in will now be available to those users or groups.

The deployment of the Add-in may take a few minutes to complete, however, Office will notify you once the installation is complete. Users will then need to restart their Outlook in order to see the Outlook Add-in appear in their instance.

To install the WESS Add-in on a hosted MS Exchange environment you will need to first log in to your Outlook Web App page for your organisation. Once you are at the login page you will need to enter your login details and sign in.

Once logged in, select the Settings Menu (cog icon) in the top right-hand corner of the screen.

This will open a new menu, you will need to select Options.

This will open a new menu, you will need to expand the General tab and select Manage add-ins.

Select the plus (+) icon this will open a new menu asking you for the source of the install. You will need to select Add from a URL.

This will open a new dialogue box with a URL field, where you will need to enter the following URL: https://wess.invisible.io/api/private/mailapp/manifest and then press Next.

Then click Install.