The Converse Inbox is:

•A minimized version of the Converse Desk.

•It enables user to respond to new or unread messages, opportunities from leads or prospects with ease, without disrupting their workflow.

•It can be accessed from object pages, sales and service consoles as well as from the Salesforce Mobile App.

•It provides similar feature benefits like the Converse Desk.

You can use the following code snippet to integrate the Embedded Desk in Visualforce pages for Classic versions:

<apex:page showHeader="false" standardController="Lead">

    <apex:includeLightning rendered="true"/>
    <div id="lightning" />

    <script>
        var recordId = "{!$CurrentPage.parameters.id}";
        $Lightning.use(
            "smagicinteract:conversationApp", 
            function() {
                $Lightning.createComponent(
                    "smagicinteract:conversationView",
                    {
                         recordId : recordId,
                         embedContext : "detail",
                         uiContext : "classic"
                    },
                    "lightning",
                    function(cmp) {
                    }

Check and modify the following attributes in the code: