O365 Administrators can install the Outlook Web add-in following the below steps:
- Navigate to Settings>Integrated Apps:
- Within the Integrated apps area, select the Add-ins options:
- Click Deploy Add-in:
- Click Next on the below screen:
- Select the Upload custom apps as below:
- Select 'I have the manifest file (.xml) on this device', and upload the MetaCompliance manifest file supplied by the MetaCompliance Support Team:
- To finalise configuration, select 'Everyone' within the Assign Users area, and select 'Fixed (Default)’ within the Deployment Method area.