Deploying the ManageEngine Endpoint Central Web Add-in for Outlook

Deploy the Add-in via Microsoft 365 Admin Center

Follow the steps below to upload and deploy the add-in manifest to your Microsoft 365 organization.

1. Log in to the Microsoft 365 Admin Center.
2. Navigate to Settings → Integrated apps → Add-ins.

3. Click Deploy Add-in → Next → Upload custom apps.

4. Select the option to upload a manifest file.

5. Download the manifest.xml file, then browse to select it and click Upload.

6. The Admin Center will validate the file and display the add-in's details. Click Deploy.

7. The add-in will be automatically installed for your users the next time they open the Outlook desktop client, after a brief propagation period.

Verifying the Add-in Installation in Outlook

After deploying the Endpoint DLP add-in, verify that it has been successfully installed on user endpoints.

Check Add-in Status in Outlook Desktop (Windows)

1. Open Outlook (desktop application).
2. Go to File → Options → Add-ins.
3. In the Manage add-ins dropdown, select COM Add-ins.
4. Look for an entry named ManageEngine Endpoint Central DLP or similar.
5. If visible: The add-in is installed. Check whether it is Enabled (checked) or Disabled (unchecked).
6. If not visible: The add-in has not been installed yet. Wait for policy deployment to complete (typically 90 minutes) and refresh Outlook.

Alternative: Check via Outlook Trust Center

1. Open Outlook.
2. Go to File → Trust Center → Trust Center Settings → Add-ins.
3. View the list of installed add-ins.
4. Search for the Endpoint DLP add-in entry.

For Microsoft 365 (Cloud)

1. In Outlook Web Access (OWA) or Outlook Desktop, add-in status is managed via the Microsoft 365 Admin Center.
2. Endpoint DLP add-ins deployed via the Microsoft 365 Admin Center are automatically installed for users after policy propagation.
3. If the add-in is not visible after 24 hours, verify the deployment status in Microsoft 365 Admin Center → Integrated apps → Add-ins.