Create an Outlook mobile add-in for an online-meeting provider

Setting up an online meeting is a core experience for an Outlook user, and it's easy to create a Teams meeting with Outlook mobile. However, creating an online meeting in Outlook with a non-Microsoft service can be cumbersome. By implementing this feature, service providers can streamline the online meeting creation experience for their Outlook add-in users.


This feature is only supported on Android and iOS with a Microsoft 365 subscription.

In this article, you'll learn how to set up your Outlook mobile add-in to enable users to organize and join a meeting using your online-meeting service. Throughout this article, we'll be using a fictional online-meeting service provider, "Contoso".

Set up your environment

Complete the Outlook quick start which creates an add-in project with the Yeoman generator for Office Add-ins.

Configure the manifest

To enable users to create online meetings with your add-in, you must configure the MobileOnlineMeetingCommandSurface extension point in the manifest under the parent element MobileFormFactor. Other form factors are not supported.

  1. In your code editor, open the quick start project.

  2. Open the manifest.xml file located at the root of your project.

  3. Select the entire <VersionOverrides> node (including open and close tags) and replace it with the following XML.

<VersionOverrides xmlns="" xsi:type="VersionOverridesV1_0">
  <VersionOverrides xmlns="" xsi:type="VersionOverridesV1_1">
    <Description resid="residDescription"></Description>
        <bt:Set Name="Mailbox" MinVersion="1.3"/>
      <Host xsi:type="MailHost">
          <FunctionFile resid="residFunctionFile"/>
          <ExtensionPoint xsi:type="AppointmentOrganizerCommandSurface">
            <OfficeTab id="TabDefault">
              <Group id="apptComposeGroup">
                <Label resid="residDescription"/>
                <Control xsi:type="Button" id="insertMeetingButton">
                  <Label resid="residLabel"/>
                    <Title resid="residLabel"/>
                    <Description resid="residTooltip"/>
                    <bt:Image size="16" resid="icon-16"/>
                    <bt:Image size="32" resid="icon-32"/>
                    <bt:Image size="64" resid="icon-64"/>
                    <bt:Image size="80" resid="icon-80"/>
                  <Action xsi:type="ExecuteFunction">

          <FunctionFile resid="residFunctionFile"/>
          <ExtensionPoint xsi:type="MobileOnlineMeetingCommandSurface">
            <Control xsi:type="MobileButton" id="insertMeetingButton">
              <Label resid="residLabel"/>
                <bt:Image size="25" scale="1" resid="icon-16"/>
                <bt:Image size="25" scale="2" resid="icon-16"/>
                <bt:Image size="25" scale="3" resid="icon-16"/>

                <bt:Image size="32" scale="1" resid="icon-32"/>
                <bt:Image size="32" scale="2" resid="icon-32"/>
                <bt:Image size="32" scale="3" resid="icon-32"/>

                <bt:Image size="48" scale="1" resid="icon-48"/>
                <bt:Image size="48" scale="2" resid="icon-48"/>
                <bt:Image size="48" scale="3" resid="icon-48"/>
              <Action xsi:type="ExecuteFunction">
        <bt:Image id="icon-16" DefaultValue=""/>
        <bt:Image id="icon-32" DefaultValue=""/>
        <bt:Image id="icon-48" DefaultValue=""/>
        <bt:Image id="icon-64" DefaultValue=""/>
        <bt:Image id="icon-80" DefaultValue=""/>
        <bt:Url id="residFunctionFile" DefaultValue=""/>
        <bt:String id="residDescription" DefaultValue="Contoso meeting"/>
        <bt:String id="residLabel" DefaultValue="Add a contoso meeting"/>
        <bt:String id="residTooltip" DefaultValue="Add a contoso meeting to this appointment."/>


To learn more about manifests for Outlook add-ins, see Outlook add-in manifests and Add support for add-in commands for Outlook Mobile.

Implement adding online meeting details

In this section, learn how your add-in script can update a user's meeting to include online meeting details.

  1. From the same quick start project, open the file ./src/commands/commands.js in your code editor.

  2. Replace the entire content of the commands.js file with the following JavaScript.

    // 1. How to construct online meeting details.
    // Not shown: How to get the meeting organizer's ID and other details from your service.
    const newBody = '<br>' +
        '<a href="" target="_blank">Join Contoso meeting</a>' +
        '<br><br>' +
        'Phone Dial-in: +1(123)456-7890' +
        '<br><br>' +
        'Meeting ID: 123 456 789' +
        '<br><br>' +
        'Want to test your video connection?' +
        '<br><br>' +
        '<a href="" target="_blank">Join test meeting</a>' +
    var mailboxItem;
    // Office is ready.
    Office.onReady(function () {
            mailboxItem = Office.context.mailbox.item;
    // 2. How to define a UI-less function named `insertContosoMeeting` (referenced in the manifest)
    //    to update the meeting body with the online meeting details.
    function insertContosoMeeting(event) {
        // Get HTML body from the client.
            { asyncContext: event },
            function (getBodyResult) {
                if (getBodyResult.status === Office.AsyncResultStatus.Succeeded) {
                    updateBody(getBodyResult.asyncContext, getBodyResult.value);
                } else {
                    console.error("Failed to get HTML body.");
                    getBodyResult.asyncContext.completed({ allowEvent: false });
    // 3. How to implement a supporting function `updateBody`
    //    that appends the online meeting details to the current body of the meeting.
    function updateBody(event, existingBody) {
        // Append new body to the existing body.
        mailboxItem.body.setAsync(existingBody + newBody,
            { asyncContext: event, coercionType: "html" },
            function (setBodyResult) {
                if (setBodyResult.status === Office.AsyncResultStatus.Succeeded) {
                    setBodyResult.asyncContext.completed({ allowEvent: true });
                } else {
                    console.error("Failed to set HTML body.");
                    setBodyResult.asyncContext.completed({ allowEvent: false });
    function getGlobal() {
      return typeof self !== "undefined"
        ? self
        : typeof window !== "undefined"
        ? window
        : typeof global !== "undefined"
        ? global
        : undefined;
    const g = getGlobal();
    // The add-in command functions need to be available in global scope.
    g.insertContosoMeeting = insertContosoMeeting;

Testing and validation

Follow the usual guidance to test and validate your add-in. After sideloading in Outlook on the web, Windows, or Mac, restart Outlook on your Android or iOS mobile device. Then, on a new meeting screen, verify that the Microsoft Teams or Skype toggle is replaced with your own.

Create meeting UI

As a meeting organizer, you should see screens similar to the following three images when you create a meeting.

The create meeting screen on Android - Contoso toggle off. The create meeting screen on Android - loading Contoso toggle. The create meeting screen on Android - Contoso toggle on.

Join meeting UI

As a meeting attendee, you should see a screen similar to the following image when you view the meeting.

Screenshot of join meeting screen on Android.


If you don't see the Join link, it may be that the online-meeting template for your service is not registered on our servers. See the Register your online-meeting template section for details.

Register your online-meeting template

If you would like to register the online-meeting template for your service, you can create a GitHub issue with the details. After that, we'll contact you to coordinate registration timeline.

  1. Go to the Feedback section at the end of this article.
  2. Press the This page link.
  3. Set the Title of the new issue to "Register the online-meeting template for my-service", replacing my-service with your service name.
  4. In the issue body, replace the string "[Enter feedback here]" with the string you set in the newBody or similar variable from the Implement adding online meeting details section earlier in this article.
  5. Click Submit new issue.

screenshot of new GitHub issue screen with Contoso sample content.

Available APIs

The following APIs are available for this feature.


Several restrictions apply.

  • Applicable only to online-meeting service providers.
  • Only admin-installed add-ins will appear on the meeting compose screen, replacing the default Teams or Skype option. User-installed add-ins won't activate.
  • The add-in icon should be in grayscale using hex code #919191 or its equivalent in other color formats.
  • Only one UI-less command is supported in Appointment Organizer (compose) mode.
  • The add-in should update the meeting details in the appointment form within the one-minute timeout period. However, any time spent in a dialog box the add-in opened for authentication, etc. is excluded from the timeout period.

See also