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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
---
title: Outlook add-in API preview requirement set
description: Features and APIs that are currently in preview for Outlook add-ins.
ms.date: 11/14/2025
ms.date: 11/20/2025
ms.topic: whats-new
ms.localizationpriority: medium
---
Expand Down Expand Up @@ -95,6 +95,20 @@ Added a method to get the status of EWS callback tokens in an organization.

---

### Customize the Smart Alerts dialog message using Markdown in Outlook on Mac

#### [errorMessageMarkdown](/javascript/api/outlook/office.smartalertseventcompletedoptions?view=outlook-js-preview&preserve-view=true#outlook-office-smartalertseventcompletedoptions-errormessagemarkdown-member) property of the `event.completed` method

Updated the `errorMessageMarkdown` property of the `event.completed` method to include support in Outlook on Mac.

**Available in**: Outlook on Mac

<br>

---

---

### Decrypt a message and its attachments

#### [OnMessageRead event](/office/dev/add-ins/develop/event-based-activation#outlook-events)
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