Office.NotificationMessageAction interface   
The definition of the action for a notification message.
Remarks
Minimum permission level: read item
Applicable Outlook mode: Compose or Read
Important: In modern Outlook on the web and new Outlook on Windows, the NotificationMessageAction object is available in Compose mode only.
Examples
// Link to full sample: https://raw.githubusercontent.com/OfficeDev/office-js-snippets/prod/samples/outlook/35-notifications/add-getall-remove.yaml
// Adds an informational message with actions to the mail item.
const id = (document.getElementById("notificationId") as HTMLInputElement).value;
const itemId = Office.context.mailbox.item.itemId;
const details = {
  type: Office.MailboxEnums.ItemNotificationMessageType.InsightMessage,
  message: "This is an insight notification with id = " + id,
  icon: "PG.Icon.16",
  actions: [
    {
      actionText: "Open insight",
      actionType: Office.MailboxEnums.ActionType.ShowTaskPane,
      // Identify whether the current mail item is in read or compose mode to set the appropriate commandId value.
      commandId: (itemId == undefined ? "PG.HelpCommand.Compose" : "PG.HelpCommand.Read"),
      contextData: { a: "aValue", b: "bValue" }
    }
  ]
};
Office.context.mailbox.item.notificationMessages.addAsync(id, details, handleResult);
Properties
| action | The text of the action link. | 
| action | The type of action to be performed.  | 
| command | The button defined in the manifest. | 
| context | Any JSON data the action button needs to pass on to the add-in. | 
Property Details
		actionText
	 
	The text of the action link.
actionText: string;Property Value
string
		actionType
	 
	The type of action to be performed. ActionType.ShowTaskPane is the only supported action.
actionType: string | MailboxEnums.ActionType;Property Value
string | Office.MailboxEnums.ActionType
		commandId
	 
	The button defined in the manifest.
commandId: string;Property Value
string
		contextData
	 
	Any JSON data the action button needs to pass on to the add-in.
contextData: any;Property Value
any
Remarks
Important:
- In Outlook on Windows, the - anytype is supported starting in Version 2402 (Build 17308.20000). In earlier versions of Outlook on Windows, only the- stringtype is supported.
- To retrieve the JSON data, call - Office.context.mailboxitem.getInitializationContextAsync. If you create a JSON string using- JSON.stringify()and assign it to the- contextDataproperty, you must parse the string using- JSON.parse()once you retrieve it.
- To prevent the task pane of a notification message from relaunching if it's already open, implement a handler for the - Office.EventType.InitializationContextChangedevent. You can then pass the event arguments to the- contextDataproperty.