Rebex Graph

using (var client = new Rebex.Net.GraphClient())
{
    // connect and authenticate to Exchange Online (Microsoft 365) server
    client.Connect();
    client.Login(token);

    // get list of top 10 unread messages in Inbox and show their headers
    var page = new GraphPageView(0, 10);
    var unread = GraphMessageSearchParameter.IsRead(false);
    var list = client.Search(GraphFolderId.Inbox, page, unread);

    foreach (var info in list)
    {
        Console.WriteLine("{0}: {1}", info.ReceivedDate, info.Subject);
    }
}

.NET library for accessing Microsoft 365 (Exchange Online) using Microsoft Graph API. Makes it possible to send, receive, list and search e-mail messages. Supports TLS 1.3/1.2 and S/MIME.

Also includes SMTP library for sending e-mails using SMTP servers.