Mailbox.displayMessageForm method (JavaScript API for Office v1.1)

JavaScript API for Office v1.1

Displays an existing message.

Last modified: November 24, 2014

Applicable Outlook modes

Compose or read

Available in requirement sets




The Exchange Web Services (EWS) identifier for an existing message.

The displayMessageForm method opens an existing message in a new window on the desktop or in a dialog box on mobile devices.

In Outlook Web App, this method opens the specified form only if the body of the form is less than or equal to 32 KB number of characters.

If the specified item identifier does not identify an existing message, no message will be displayed on the client computer, and no error message will be returned.

Do not use the displayMessageForm with an itemId that represents an appointment. Use the Mailbox.displayAppointmentForm method to display an existing appointment, and Mailbox.displayNewAppointmentForm to display a form to create a new appointment.

In this article, "Outlook" refers to Outlook for Windows, Outlook for Mac, Outlook RT, OWA for Devices (OWA for Android phones, OWA for iPad, OWA for iPhone), and Outlook Web App. "Outlook rich clients" refers to Outlook for Windows, Outlook for Mac and Outlook RT. At this point, Outlook for Mac supports JavaScript API for Office in only Outlook read mode, and can activate mail apps that reference office.js version 1.0 or 1.1 and use apps for Office schema version 1.0.

The following code example in JavaScript obtains the selected item, checks if the item is a message, and displays it in a message form.

var myOm;
var myItem;

// Initialize runtime.
// The initialize function is required for all apps.
Office.initialize = function () {
    myOm = Office.context.mailbox;
    // Get the selected item.
    myItem = myOm.item;

    // Checks for the DOM to load using the jQuery ready function.
    $(document).ready(function () {
        // After the DOM is loaded, can display content in app UI.
function displaySelectedMessage()
    // Display selected item only if the item is a message.
    if (myitem.itemType == Office.MailboxEnums.ItemType.Message)
        alert ("Selected item is not an email message.");

App types

Mail app

Supported clients

Outlook 2013, Outlook 2013 SP1, Outlook 2013 RT, Outlook Web App, OWA for Devices, Outlook for Mac





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