---
title: "Outlook Add-in supported environments"
slug: "supported-environments-for-the-opensense-outlook-add-in"
description: "Supported Outlook clients and minimum versions, licenses, and deployment requirements for the Opensense Outlook Add-in, plus unsupported environments."
updated: 2026-08-21T14:56:08.000Z
canonical: "https://help.opensense.com/docs/supported-environments-for-the-opensense-outlook-add-in"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.opensense.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Outlook Add-in supported environments

## Overview

This article lists the supported platforms, Outlook client versions, and Microsoft 365 requirements for the Opensense Outlook Add-in. Confirm that users meet all the requirements before you deploy or troubleshoot the add-in.

:::note[GCC High]
GCC High environments are supported. See [Opensense Outlook Add-in integration with GCC High environments](https://help.opensense.com/docs/opensense-add-in-integration-with-gcc-high-environments) for requirements and configuration.
:::

## General requirements

All of these conditions must be met to deploy and use the add-in:

<dl class="kb-insights-summary">
  <div><dt>Mailbox</dt><dd>Hosted on Exchange Online (Microsoft 365). On-premises Exchange is not supported for add-in deployment.</dd></div>
  <div><dt>License</dt><dd>A supported Microsoft 365 or Office 365 plan. See <a href="#license-requirements">License requirements</a>.</dd></div>
  <div><dt>Outlook client</dt><dd>Meets or exceeds the minimum supported version. See <a href="#supported-outlook-clients">Supported Outlook clients</a>.</dd></div>
  <div><dt>Office JavaScript API</dt><dd>Version 1.10 or later. Some features need version 1.13, available on Microsoft 365 subscriptions only.</dd></div>
  <div><dt>Directory</dt><dd>The subscription directory is in, or federated to, Microsoft Entra ID.</dd></div>
</dl>

Not sure which version of Outlook you have? See Microsoft's guide: [What version of Outlook do I have?](https://support.microsoft.com/en-us/office/what-version-of-outlook-do-i-have-b3a9568c-edb5-42b9-9825-d48d82b2257c)


## Supported Outlook clients

<div class="kb-deployment-compare kb-deployment-compare--plain">
  <div class="kb-deployment-compare__viewport" role="region" aria-label="Supported Outlook clients" tabindex="0">
    <table>
      <colgroup><col class="kb-deployment-compare__feature-col"></colgroup>
      <thead>
        <tr>
          <th scope="col">Client</th>
          <th scope="col"><span class="kb-deployment-compare__method">Minimum version</span></th>
          <th scope="col"><span class="kb-deployment-compare__method">Notes</span></th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <th scope="row">Classic Outlook for Windows<span class="kb-deployment-compare__row-note">Windows</span></th>
          <td>Version 2104 (Build 13929.20296)</td>
          <td>Must be Click-to-Run. MSI-based installs are not supported.</td>
        </tr>
        <tr>
          <th scope="row">New Outlook for Windows<span class="kb-deployment-compare__row-note">Windows</span></th>
          <td>Windows 10 Version 1809 (Build 17763) or later</td>
          <td>New Outlook updates continuously and has no minimum build requirement beyond the OS version.</td>
        </tr>
        <tr>
          <th scope="row">Outlook on the web (OWA)<span class="kb-deployment-compare__row-note">Windows</span></th>
          <td>Any supported modern browser</td>
          <td>Full add-in functionality supported.</td>
        </tr>
        <tr>
          <th scope="row">New Outlook for Mac<span class="kb-deployment-compare__row-note">Mac</span></th>
          <td>Version 16.38.506 or later</td>
          <td>New Outlook interface required. Legacy Outlook for Mac is not supported.</td>
        </tr>
        <tr>
          <th scope="row">Outlook for iOS<span class="kb-deployment-compare__row-note">Mobile</span></th>
          <td>Version 2.75.0 or later</td>
          <td>Must be connected to Exchange Online. See <a href="https://help.opensense.com/docs/how-to-access-opensense-outlook-add-in-on-ios">Using the Opensense Outlook Add-in on iOS</a>.</td>
        </tr>
        <tr>
          <th scope="row">Outlook for Android<span class="kb-deployment-compare__row-note">Mobile</span></th>
          <td>Version 2.2.145 or later</td>
          <td>Must be connected to Exchange Online. See <a href="https://help.opensense.com/docs/how-to-access-opensense-outlook-add-in-on-android">Using the Opensense Outlook Add-in on Android</a>.</td>
        </tr>
      </tbody>
    </table>
  </div>
</div>

To turn on the New Outlook interface on a Mac, open Outlook, go to **Outlook** menu > **New Outlook**, and make sure the toggle is on.

## Unsupported environments

- On-premises Exchange. The add-in is not supported, but Opensense supports on-premises Exchange through ExSBR by MessageConcepts. Contact [help@opensense.com](mailto:help@opensense.com) for details.
- POP and IMAP accounts
- Volume-licensed Office (Office 2016, 2019, and 2021 LTSC), which doesn't support the required API version
- Legacy Outlook for Mac
- MSI-based Office installs
- GoDaddy-managed Microsoft 365 accounts
- Office 365 E1 and E2 plans

## License requirements

Users need one of these Microsoft 365 or Office 365 licenses. The add-in is deployed from Microsoft AppSource through Integrated Apps, and not all plans include AppSource access.

<div class="kb-pros-cons">
  <div class="kb-pros-cons__pros">
    <p class="kb-pros-cons__label" id="licenses-supported">Supported</p>
    <ul aria-labelledby="licenses-supported">
      <li>Microsoft 365 Business Basic, Standard, Premium</li>
      <li>Office 365 / Microsoft 365 Enterprise E3, E5, F3</li>
      <li>Office 365 / Microsoft 365 Education A1, A3, A5</li>
      <li>Office 365 / Microsoft 365 Government G3, G5</li>
    </ul>
  </div>
  <div class="kb-pros-cons__cons">
    <p class="kb-pros-cons__label" id="licenses-not-supported">Not supported</p>
    <ul aria-labelledby="licenses-not-supported">
      <li>Office 365 E1</li>
      <li>Office 365 E2</li>
      <li>Microsoft 365 Apps for Business or Enterprise (no Exchange Online)</li>
      <li>GoDaddy-managed Microsoft 365</li>
    </ul>
  </div>
</div>

If you're not sure whether your plan qualifies, see [Microsoft's Centralized Deployment requirements guide](https://learn.microsoft.com/en-us/microsoft-365/admin/manage/centralized-deployment-of-add-ins?view=o365-worldwide), which includes a compatibility checker.

## Deployment requirements

The add-in is deployed through Microsoft 365 Integrated Apps with Centralized Deployment, which is supported in most Microsoft 365 tenants. If you're not sure whether your organization qualifies, use Microsoft's [compatibility checker](https://learn.microsoft.com/en-us/microsoft-365/admin/manage/centralized-deployment-of-add-ins?view=o365-worldwide#centralized-deployment-compatibility-checker).

- Nested groups are not supported for add-in scoping. Users must be members of a top-level group.
- The admin who deploys the add-in needs Global Administrator or Exchange Administrator permissions.


## What's next

- [Outlook Add-in overview](https://help.opensense.com/docs/outlook-add-in-overview-1)
- [Scoping Outlook Add-in users in the Microsoft 365 admin center](https://help.opensense.com/docs/clone-outlook-add-in-scope-users-for-opensense-in-m365-admin): deploy the add-in to your users.
- [Troubleshooting the Outlook Add-in](https://help.opensense.com/docs/outlook-add-in-troubleshooting-guide-2)