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docs/docs-ref-autogen/outlook/outlook.yml

@@ -19,6 +19,8 @@ interfaces:
   - outlook!Office.CoercionTypeOptions:interface
   - outlook!Office.Contact:interface
   - outlook!Office.CustomProperties:interface
+  - outlook!Office.DecryptedMessageAttachment:interface
+  - outlook!Office.DecryptedMessageBody:interface
   - outlook!Office.DelayDeliveryTime:interface
   - outlook!Office.Diagnostics:interface
   - outlook!Office.Display:interface
@@ -55,6 +57,7 @@ interfaces:
   - outlook!Office.MeetingSuggestion:interface
   - outlook!Office.Message:interface
   - outlook!Office.MessageCompose:interface
+  - outlook!Office.MessageDecryptEventCompletedOptions:interface
   - outlook!Office.MessageRead:interface
   - outlook!Office.NotificationMessageAction:interface
   - outlook!Office.NotificationMessageDetails:interface

docs/docs-ref-autogen/outlook/outlook/office.attachmentdetailscompose.yml

@@ -129,8 +129,12 @@ properties:
       **Important**:
 
 
-      - The `contentId` property is only supported in Outlook on the web and the
-      new Outlook on Windows.
+      - The `contentId` property is only supported in Outlook on the web and
+      Outlook on Windows (new and classic (preview)). To preview the `contentId`
+      property in classic Outlook on Windows, your Outlook client must run
+      Version 2510 (Build 19312.20000) or later and must be on the Beta Channel.
+      For more information, see [Microsoft 365 Insider
+      Program](https://aka.ms/Msft365InsiderProgram)<!-- -->.
 
 
       - Starting November 15, 2025, changes to how inline images are represented

docs/docs-ref-autogen/outlook/outlook/office.decryptedmessageattachment.yml

@@ -0,0 +1,217 @@
+### YamlMime:TSType
+name: Office.DecryptedMessageAttachment
+uid: outlook!Office.DecryptedMessageAttachment:interface
+package: outlook!
+fullName: Office.DecryptedMessageAttachment
+summary: Represents an attachment in a decrypted message.
+remarks: >-
+  \[ [API set: Mailbox
+  preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+  \]
+
+
+  **[Minimum permission
+  level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+  -->**: **read/write item**
+
+
+  **[Applicable Outlook
+  mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+  -->**: Message Read
+
+
+  To learn how to develop an encryption add-in in Outlook, see [Create an
+  encryption Outlook
+  add-in](https://learn.microsoft.com/office/dev/add-ins/outlook/encryption-decryption)<!--
+  -->.
+
+isPreview: true
+isDeprecated: false
+type: interface
+properties:
+  - name: attachmentType
+    uid: outlook!Office.DecryptedMessageAttachment#attachmentType:member
+    package: outlook!
+    fullName: attachmentType
+    summary: Specifies the type of attachment.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'attachmentType: MailboxEnums.AttachmentType;'
+      return:
+        type: <xref uid="outlook!Office.MailboxEnums.AttachmentType:enum" />
+  - name: content
+    uid: outlook!Office.DecryptedMessageAttachment#content:member
+    package: outlook!
+    fullName: content
+    summary: Specifies the Base64-encoded content of the attachment.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+
+      **Important**: The `content` property isn't supported by attachments
+      of type `MailboxEnums.AttachmentType.Cloud`<!-- -->.
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'content: string;'
+      return:
+        type: string
+  - name: contentId
+    uid: outlook!Office.DecryptedMessageAttachment#contentId:member
+    package: outlook!
+    fullName: contentId
+    summary: >-
+      Specifies the content identifier of an inline attachment.
+
+
+      The `contentId` property must be specified if `isInline` is set to
+      `true`<!-- -->.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+
+      **Important**: When images are added to a message as inline
+      attachments, they're automatically assigned a content ID. In the body of a
+      message, the content ID of an inline attachment is specified in the `src`
+      attribute of the `<img>` element (for example, `<img width=96 height=96
+      id="Picture_1" src="cid:image001.png@01DC1E6F.FC7C7410">`<!-- -->). To
+      easily identify and provide these inline attachments during decryption, we
+      recommend saving the content IDs of inline attachments to the message
+      header during encryption. Call
+      `Office.context.mailbox.item.getAttachmentsAsync` to get the content ID of
+      an inline attachment. Then, call
+      `Office.context.mailbox.item.internetHeaders.setAsync` to save the ID to
+      the header of the message.
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'contentId?: string;'
+      return:
+        type: string
+  - name: isInline
+    uid: outlook!Office.DecryptedMessageAttachment#isInline:member
+    package: outlook!
+    fullName: isInline
+    summary: >-
+      If true, specifies that the decrypted attachment appears as an image in
+      the body of the message instead of in the attachment list. If the
+      `isInline` property isn't specified, its value is set to false.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'isInline?: boolean;'
+      return:
+        type: boolean
+  - name: name
+    uid: outlook!Office.DecryptedMessageAttachment#name:member
+    package: outlook!
+    fullName: name
+    summary: Specifies the name of the attachment.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'name: string;'
+      return:
+        type: string
+  - name: path
+    uid: outlook!Office.DecryptedMessageAttachment#path:member
+    package: outlook!
+    fullName: path
+    summary: >-
+      Specifies the URL reference path of the attachment if its type is
+      `MailboxEnums.AttachmentType.Cloud`<!-- -->. The `path` property must be
+      specified for attachments of type `MailboxEnums.AttachmentType.Cloud`<!--
+      -->.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'path?: string;'
+      return:
+        type: string

docs/docs-ref-autogen/outlook/outlook/office.decryptedmessagebody.yml

@@ -0,0 +1,86 @@
+### YamlMime:TSType
+name: Office.DecryptedMessageBody
+uid: outlook!Office.DecryptedMessageBody:interface
+package: outlook!
+fullName: Office.DecryptedMessageBody
+summary: Represents the body of a decrypted message.
+remarks: >-
+  \[ [API set: Mailbox
+  preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+  \]
+
+
+  **[Minimum permission
+  level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+  -->**: **read/write item**
+
+
+  **[Applicable Outlook
+  mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+  -->**: Message Read
+
+
+  To learn how to develop an encryption add-in in Outlook, see [Create an
+  encryption Outlook
+  add-in](https://learn.microsoft.com/office/dev/add-ins/outlook/encryption-decryption)<!--
+  -->.
+
+isPreview: true
+isDeprecated: false
+type: interface
+properties:
+  - name: coercionType
+    uid: outlook!Office.DecryptedMessageBody#coercionType:member
+    package: outlook!
+    fullName: coercionType
+    summary: >-
+      Specifies the format of the body of a message. The body of a message can
+      be formatted as `Office.CoercionType.Html` or
+      `Office.CoercionType.Text`<!-- -->.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'coercionType: Office.CoercionType;'
+      return:
+        type: <xref uid="office!Office.CoercionType:enum" />
+  - name: content
+    uid: outlook!Office.DecryptedMessageBody#content:member
+    package: outlook!
+    fullName: content
+    summary: Specifies the content displayed in the body of the message.
+    remarks: >-
+      \[ [API set: Mailbox
+      preview](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
+      \]
+
+
+      **[Minimum permission
+      level](https://learn.microsoft.com/office/dev/add-ins/outlook/understanding-outlook-add-in-permissions)<!--
+      -->**: **read/write item**
+
+
+      **[Applicable Outlook
+      mode](https://learn.microsoft.com/office/dev/add-ins/outlook/outlook-add-ins-overview#extension-points)<!--
+      -->**: Message Read
+
+    isPreview: true
+    isDeprecated: false
+    syntax:
+      content: 'content: string;'
+      return:
+        type: string

docs/docs-ref-autogen/outlook/outlook/office.mailboxevent.yml

@@ -9,9 +9,11 @@ summary: >-
   activation](https://learn.microsoft.com/office/dev/add-ins/develop/event-based-activation)<!--
   -->, including [Smart
   Alerts](https://learn.microsoft.com/office/dev/add-ins/outlook/onmessagesend-onappointmentsend-events)<!--
-  -->, or the [integrated spam-reporting
+  -->, the [integrated spam-reporting
   feature](https://learn.microsoft.com/office/dev/add-ins/outlook/spam-reporting)<!--
-  -->. It allows the add-in to signify to the Outlook client that it has
+  -->, or
+  [decryption](https://learn.microsoft.com/office/dev/add-ins/outlook/encryption-decryption)
+  (preview). It allows the add-in to signify to the Outlook client that it has
   completed processing an event.
 remarks: >-
   \[ [API set: Mailbox
@@ -57,8 +59,8 @@ methods:
     package: outlook!
     fullName: completed(options)
     summary: >-
-      Indicates that the event-based or spam-reporting add-in has completed
-      processing an event.
+      Indicates that the event-based, spam-reporting, or decryption (preview)
+      add-in has completed processing an event.
     remarks: >-
       \[ [API set: Mailbox
       1.10](/javascript/api/requirement-sets/outlook/outlook-api-requirement-sets)
@@ -122,17 +124,22 @@ methods:
     syntax:
       content: >-
         completed(options?: SmartAlertsEventCompletedOptions |
-        SpamReportingEventCompletedOptions): void;
+        SpamReportingEventCompletedOptions |
+        MessageDecryptEventCompletedOptions): void;
       parameters:
         - id: options
           description: >-
-            Optional. An object that specifies the behavior of an event-based or
-            spam-reporting add-in when it completes processing an event.
+            Optional. An object that specifies the behavior of an event-based,
+            spam-reporting, or decryption add-in when it completes processing an
+            event.
           type: >-
             <xref
             uid="outlook!Office.SmartAlertsEventCompletedOptions:interface" /> |
             <xref
             uid="outlook!Office.SpamReportingEventCompletedOptions:interface" />
+            | <xref
+            uid="outlook!Office.MessageDecryptEventCompletedOptions:interface"
+            />
       return:
         type: void
         description: ''