# Deploying the ManageEngine Endpoint Central Web Add-in for Outlook

Last Updated On: 08 Sep 2026

This page explains how to deploy the Endpoint Central Web Add-in for Outlook using the Microsoft 365 Admin Center, and how to verify the add-in has been successfully installed on user endpoints.

## 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**.

![Microsoft 365 Admin Center showing the Settings menu with Integrated apps and Add-ins options highlighted](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-5.png)

Microsoft 365 Admin Center — navigate to Settings → Integrated apps → Add-ins.

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

![Deploy Add-in dialog in Microsoft 365 Admin Center showing the Next and Upload custom apps options](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-2.png)

Deploy Add-in dialog — click Next, then select Upload custom apps.

4. Select the option to **upload a manifest file**.

![Custom app upload screen showing the Upload manifest file option selected](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-3.png)

Custom app upload — select the Upload manifest file option.

5. Download the [manifest.xml](https://www.manageengine.com/endpoint-dlp/outlook-addin/manifest.xml) file, then browse to select it and click **Upload**.

![File browser showing the manifest.xml file selected for upload](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-4.png)

Select the manifest.xml file and click Upload.

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

![Admin Center add-in details screen showing the validated manifest and the Deploy button](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-6.png)

Add-in details screen — review the validated manifest and 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.

![Outlook desktop client showing the Endpoint Central Web Add-in installed and visible in the toolbar](https://www.manageengine.com/products/desktop-central/help/images/outlook-addin-7.png)

The Endpoint Central Web Add-in installed and visible in the Outlook desktop client.

## 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**.

### Note

- Add-in installation requires the user endpoint to receive and process the DLP policy (default 90-minute refresh cycle).
- Web-based Outlook (OWA) does not support the Endpoint DLP add-in — only the Outlook desktop client is supported.
- If the add-in is disabled, sensitive email monitoring will not function. Contact your IT administrator to enable it.