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

# New vs classic Outlook

> Lanten supports both — here's how to tell which you're running, and where Lanten lives in each.

Microsoft currently ships two Outlooks for Windows, and plenty of agencies run a mix. Lanten supports both — plus the web and Mac versions — but knowing which one you're in makes every other help page easier to follow.

## Which Outlook am I running?

The 10-second test on Windows: look at the top of the window.

* A **"New Outlook" toggle** in the top-right corner (or a left icon rail down the edge) → you're in **new Outlook**.
* A **File menu** in the top-left and the classic ribbon → you're in **classic Outlook**.

## Support matrix

| Outlook                      | Supported | Where Lanten appears                                            |
| ---------------------------- | --------- | --------------------------------------------------------------- |
| New Outlook (Windows)        | ✅         | **Apps** on the message, or the Lanten icon in the reading pane |
| Classic Outlook (Windows)    | ✅         | The ribbon, and **Get Add-ins** for install                     |
| Outlook on the web           | ✅         | **Apps** on the message                                         |
| Outlook for Mac              | ✅         | The toolbar on an open message                                  |
| Outlook mobile (iOS/Android) | Not yet   | See [Using Lanten on mobile](/outlook/mobile)                   |

{/* TODO: capture Lanten open in classic, web and Mac — images/outlook/classic.png, web.png, mac.png — and reuse across the docs */}

## Does it matter which I use?

Lanten behaves the same in all four. The differences are Outlook's, not Lanten's — where the Apps button sits, how pinning looks, and how you customise the reading pane. Where steps differ, help pages here show tabs per client — see [Pinning Lanten](/getting-started/pin-lanten) and [Customising reading-pane actions](/outlook/reading-pane-actions).

<Tip>
  If you've just switched the New Outlook toggle and Lanten seems to have vanished, it hasn't — it's installed to your mailbox, not the app. Open any email → **Apps** → Lanten, then [pin it](/getting-started/pin-lanten) again.
</Tip>