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[Outlook] (decryption) Document features in preview #2579

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6 changes: 5 additions & 1 deletion docs/requirement-sets/outlook/outlook-requirement-set-preview.md
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@@ -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: 06/23/2026
ms.date: 07/02/2026
ms.topic: whats-new
ms.localizationpriority: medium
---
Expand Down Expand Up @@ -33,6 +33,10 @@ The following features are in preview.
- Added a property to get or set whether an appointment is an all-day event.
- Added events to activate an [event-based add-in](/office/dev/add-ins/develop/event-based-activation) on a message in read mode when it contains certain attachment types or custom internet headers.
- Added a property and objects to temporarily set the body or subject displayed in read mode.
- Added support for decrypting Outlook item attachments (`Office.MailboxEnums.AttachmentType.Item`) in an encryption add-in. To learn more, see [Decrypt Outlook item attachments (preview)](/office/dev/add-ins/outlook/encryption-decryption#decrypt-outlook-item-attachments-preview).
- Added the `errorMessage` property to `MessageDecryptEventCompletedOptions` to allow encryption add-ins to display a custom error message when a decryption operation fails. To learn more, see [Customize error messages for the decryption operation (preview)](/office/dev/add-ins/outlook/encryption-decryption#customize-error-messages-for-the-decryption-operation-preview).
- Added the `accessControls` property to MessageDecryptEventCompletedOptions and the `AccessControls` object to allow encryption add-ins to restrict printing, copying, and saving of decrypted content. To learn more, see [Manage distribution of decrypted content (preview)](/office/dev/add-ins/outlook/encryption-decryption#manage-distribution-of-decrypted-content-preview).
- Added a **Retry** action to the decryption timeout notification in encryption add-ins so recipients can retry a failed decryption operation without switching to another message.

## API list

Expand Down