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

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Setting up an online meeting is a core experience for an Outlook user, and it's easy to create a Teams meeting with Outlook. 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 and joining experience for their Outlook add-in users.

Important

This feature is supported in Outlook on the web, Windows (new and classic), Mac, Android, and iOS with a Microsoft 365 subscription.

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

Set up your environment

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

Configure the manifest

The steps for configuring the manifest depend on which type of manifest you selected in the quick start.

  1. Open the manifest.json file.

  2. Find the first object in the "authorization.permissions.resourceSpecific" array and set its "name" property to "MailboxItem.ReadWrite.User". It should look like this when you're done.

    {
    "name": "MailboxItem.ReadWrite.User",
    "type": "Delegated"
}

  3. In the "validDomains" array, change the URL to "https://contoso.com", which is the URL of the fictional online meeting provider. The array should look like this when you're done.

    "validDomains": [
    "https://contoso.com"
],

  4. Add the following object to the "extensions.runtimes" array. Note the following about this code.

    • The "minVersion" of the Mailbox requirement set is set to "1.3" so the runtime won't launch on platforms and Office versions where this feature isn't supported.
    • The "id" of the runtime is set to the descriptive name "online_meeting_runtime".
    • The "code.page" property is set to the URL of UI-less HTML file that will load the function command.
    • The "lifetime" property is set to "short" which means that the runtime starts up when the function command button is selected and shuts down when the function completes. (In certain rare cases, the runtime shuts down before the handler completes. See Runtimes in Office Add-ins.)
    • There's an action to run a function named "insertContosoMeeting". You'll create this function in a later step.
    {
    "requirements": {
        "capabilities": [
            {
                "name": "Mailbox",
                "minVersion": "1.3"
            }
        ],
        "formFactors": [
            "desktop"
        ]
    },
    "id": "online_meeting_runtime",
    "type": "general",
    "code": {
        "page": "https://contoso.com/commands.html"
    },
    "lifetime": "short",
    "actions": [
        {
            "id": "insertContosoMeeting",
            "type": "executeFunction",
            "displayName": "insertContosoMeeting"
        }
    ]
}

  5. Replace the "extensions.ribbons" array with the following. Note the following about this markup.

    • The "minVersion" of the Mailbox requirement set is set to "1.3" so the the ribbon customizations won't appear on platforms and Office versions where this feature is not supported.
    • The "contexts" array specifies that the ribbon is available only in the meeting details organizer window.
    • There will be a custom control group on the default ribbon tab (of the meeting details organizer window) labelled Contoso meeting.
    • The group will have a button labelled Add meeting.
    • The button's "actionId" has been set to "insertContosoMeeting", which matches the "id" of the action you created in the previous step.
    "ribbons": [
  {
    "requirements": {
        "capabilities": [
            {
                "name": "Mailbox",
                "minVersion": "1.3"
            }
        ],
        "scopes": [
            "mail"
        ],
        "formFactors": [
            "desktop"
        ]
    },
    "contexts": [
        "meetingDetailsOrganizer"
    ],
    "tabs": [
        {
            "builtInTabId": "TabDefault",
            "groups": [
                {
                    "id": "apptComposeGroup",
                    "label": "Contoso meeting",
                    "controls": [
                        {
                            "id": "insertMeetingButton",
                            "type": "button",
                            "label": "Add meeting",
                            "icons": [
                                {
                                    "size": 16,
                                    "url": "icon-16.png"
                                },
                                {
                                    "size": 32,
                                    "url": "icon-32.png"
                                },
                                {
                                    "size": 64,
                                    "url": "icon-64_02.png"
                                },
                                {
                                    "size": 80,
                                    "url": "icon-80.png"
                                }
                            ],
                            "supertip": {
                                "title": "Add a Contoso meeting",
                                "description": "Add a Contoso meeting to this appointment."
                            },
                            "actionId": "insertContosoMeeting",
                        }
                    ]
                }
            ]
        }
    ]
  }
]

Add mobile support

  1. Open the manifest.json file.

  2. In the "extensions.ribbons.requirements.formFactors" array, add "mobile" as an item. When you're finished, the array should look like the following.

"formFactors": [
    "desktop",
    "mobile"
]
  1. In the "extensions.ribbons.contexts" array, add onlineMeetingDetailsOrganizer as an item. When you're finished, the array should look like the following.
"contexts": [
    "meetingDetailsOrganizer",
    "onlineMeetingDetailsOrganizer"
],
  1. In the "extensions.ribbons.tabs" array, find the tab with the "builtInTabId" of "TabDefault". Add a child "customMobileRibbonGroups" array to it (as a peer of the existing "groups" property). When you're finished, the "tabs" array should look like the following:
"tabs": [
    {
        "builtInTabId": "TabDefault",
        "groups": [
            <-- non-mobile group objects omitted -->
        ],
        "customMobileRibbonGroups": [
            {
                "id": "mobileApptComposeGroup",
                "label": "Contoso Meeting",
                "controls": [
                    { 
                        "id": "mobileInsertMeetingButton",
                        "label": "Add meeting",
                        "type": "mobileButton",
                        "actionId": "insertContosoMeeting",
                        "icons": [
                            {
                                "scale": 1,
                                "size": 25,
                               "url": "https://contoso.com/assets/icon-25.png"
                            },
                            {
                                "scale": 1,
                                "size": 32,
                                "url": "https://contoso.com/assets/icon-32.png"
                            },
                            {
                                "scale": 1,
                                "size": 48,
                                "url": "https://contoso.com/assets/icon-48.png"
                            },                                
                            {
                                "scale": 2,
                                "size": 25,
                                "url": "https://contoso.com/assets/icon-25.png"
                            },
                            {
                                "scale": 2,
                                "size": 32,
                                "url": "https://contoso.com/assets/icon-32.png"
                            },
                            {
                                "scale": 2,
                                "size": 48,
                                "url": "https://contoso.com/assets/icon-48.png"
                            },                                
                            {
                                "scale": 3,
                                "size": 25,
                                "url": "https://contoso.com/assets/icon-25.png"
                            },
                            {
                                "scale": 3,
                                "size": 32,
                                "url": "https://contoso.com/assets/icon-32.png"
                            },
                            {
                                "scale": 3,
                                "size": 48,
                                "url": "https://contoso.com/assets/icon-48.png"
                            }
                        ]
                    }
                ]
            }
        ]
    }
]

Tip

To learn more about manifests for Outlook add-ins, see Office Add-in manifests and Add support for add-in commands in Outlook on mobile devices.

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. The following applies to all supported platforms.

  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="https://contoso.com/meeting?id=123456789" 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="https://contoso.com/testmeeting" target="_blank">Join test meeting</a>' +
    '<br><br>';

let mailboxItem;

// Office is ready.
Office.onReady(function () {
        mailboxItem = Office.context.mailbox.item;
    }
);

// 2. How to define and register a function command 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.
    mailboxItem.body.getAsync("html",
        { 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 });
            }
        }
    );
}
// Register the function.
Office.actions.associate("insertContosoMeeting", insertContosoMeeting);

// 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 });
            }
        }
    );
}

Testing and validation

Follow the usual guidance to test and validate your add-in, then sideload the manifest in Outlook on the web, on Windows (new or classic), or on Mac. If your add-in also supports mobile, restart Outlook on your Android or iOS device after sideloading. Once the add-in is sideloaded, create a new meeting and 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 with the Contoso toggle off. The create meeting screen on Android with a loading Contoso toggle. The create meeting screen on Android with the 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.

The join meeting screen on Android.

Important

The Join button is only supported in Outlook on the web, on Mac, on Android, on iOS, and in new Outlook on Windows. If you only see a meeting link, but don't see the Join button in a supported client, it may be that the online-meeting template for your service isn't registered on our servers. See the Register your online-meeting template section for details.

Register your online-meeting template

Registering your online-meeting add-in is optional. It only applies if you want to surface the Join button in meetings, in addition to the meeting link. Once you've published your online-meeting add-in and would like to register it, create a GitHub issue using the following guidance. We'll contact you to coordinate a registration timeline.

Important

  • The Join button is only supported in Outlook on the web, on Mac, on Android, on iOS, and in new Outlook on Windows.
  • Only online-meeting add-ins published to AppSource can be registered. Line-of-business add-ins aren't supported.
  1. Create a new GitHub issue.
  2. Set the Title of the new issue to "Outlook: Register the online-meeting template for my-service", replacing my-service with your service name.
  3. In the issue body, replace the existing text with the following:
  4. Click Submit new issue.

A new GitHub issue screen with Contoso sample content.

Available APIs

The following APIs are available for this feature.

Restrictions

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 function 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, for example, is excluded from the timeout period.

See also