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[Outlook] (SessionData) Document increased SessionData size #2370

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[Outlook] (SessionData) Document increased SessionData size #2370

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16 changes: 15 additions & 1 deletion ...irement-sets/outlook/preview-requirement-set/outlook-requirement-set-preview.md
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---
title: Outlook add-in API preview requirement set
description: Features and APIs that are currently in preview for Outlook add-ins.
ms.date: 03/11/2025
ms.date: 09/26/2025
ms.topic: whats-new
ms.localizationpriority: medium
---
Expand Down Expand Up @@ -75,6 +75,20 @@ Added a new property that represents if an appointment is an all-day event.

---

### Store even more custom data for a mail item during an Outlook session

#### [Office.context.mailbox.item.sessionData.setAsync](/javascript/api/outlook/office.sessiondata?view=outlook-js-preview&preserve-view=true#outlook-office-sessiondata-setasync-member)

Updated the `SessionData` object limit to 2,621,440 characters.

**Available in**: Classic Outlook on Windows (Microsoft 365 subscription)

<br>

---

---

### Temporarily set the body or subject displayed in read mode

#### [Office.context.mailbox.item.display](/javascript/api/outlook/office.messageread?view=outlook-js-preview&preserve-view=true#outlook-office-messageread-display-member)
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