Outlook add on | Publishing internally

Publishing method: Internal (Organization only) 

Overview

This guide explains how to deploy the CASENGINE Outlook Add-in internally using the Microsoft 365 Admin Center.

Prerequisites

• Microsoft 365 Global Admin or Exchange Admin access

• Outlook (Desktop or Web)

• Internet access to CASENGINE hosting
  
  

Step 1: Download the Manifest

Download the Outlook add-in manifest file:

• Primary link:
  https://downloads.casengine.app/ce_outlook_manifest.zip

• Alternative link:
  OUTLOOK - ADDON 

Extract the ZIP file to get the XML manifest.

Step 2: Upload the Manifest (Admin Center)

1. Go to Microsoft 365 Admin Center

2. Navigate to:
   Settings → Integrated apps

3. Click Upload custom app

4. Choose Office Add-in

5. Upload the extracted manifest XML file
   
   
    
    

6. Assign users or groups
   
   

7. Complete the deployment
    

Step 3: Load / Verify the Add-in

To manually load or verify sideloading (if required):

https://aka.ms/olksideload

Restart Outlook if the add-in does not appear immediately.

Notes

• This is an internal deployment (not published to Microsoft AppSource).

• No confidential credentials are included in the manifest.

• Admin consent is required due to mailbox permissions.

Related links:

Deploy add-ins in the admin center - Microsoft 365 admin | Microsoft Learn

Publish manifest to Microsoft Store.xlsx