Q:

Office 365 send email with attachment using OutlookServicesClient

I'm trying to send out some e-mails on behalf of users of my LOB application.  I'm using the Office 365 connected service API so that I can authenticate using OAuth.  My code will send the e-mail, but no attachments show up.  Here is an isolated example of my code:  
    static async void SendUsingOutlookClient(CommunicationRow me, OutlookServicesClient outlook)
    {
        var m = new Message();
        m.From = ToRecipient(me.From);
        m.Body = new ItemBody { Content = me.Body };
        if (me.IsBodyHtml)
            m.Body.ContentType = BodyType.HTML;
        else
            m.Body.ContentType = BodyType.Text;
        m.Subject = me.Subject;
        m.CcRecipients.Add(me.Cc);
        m.BccRecipients.Add(me.Bcc);
        m.ToRecipients.Add(me.To);
        foreach (var attach in me.Attachments)
        {
            var file = attach.File;
            var fileversion = file.GetVersion(attach.Version);
            string fullpath = LibraryServiceImpl.GetFullNameInArchive(fileversion);
            var mattach = new FileAttachment { Name = file.Name, ContentId = attach.ContentId, ContentLocation = fullpath, ContentType = GraphicUtils.DetermineMime(Path.GetExtension(fullpath)) };
            if (file.Name.MissingText())
                mattach.Name = attach.ContentId + fileversion.FileExtension;
            m.Attachments.Add(mattach);
        }
        await outlook.Me.SendMailAsync(m, true);
    }

The OutlookServicesClient I am using was found here https://visualstudiogallery.msdn.microsoft.com/a15b85e6-69a7-4fdf-adda-a38066bb5155

A:

I just tried this myself, and it looks like the problem is that the OutlookServicesClient just doesn't include the attachment data when you do the send. You can see this yourself if you use Fiddler.
I'll let the folks responsible for this library know about this. In the meantime, you can make it work by first saving the message as a draft, then updating with the attachments, then sending. Something like:
// Save to Drafts folder
await outlook.Me.AddMessageAsync(m);

foreach (var attach in me.Attachments)
{
    var file = attach.File;
    var fileversion = file.GetVersion(attach.Version);
    string fullpath = LibraryServiceImpl.GetFullNameInArchive(fileversion);
    var mattach = new FileAttachment { Name = file.Name, ContentId = attach.ContentId, ContentLocation = fullpath, ContentType = GraphicUtils.DetermineMime(Path.GetExtension(fullpath)) };
    if (file.Name.MissingText())
        mattach.Name = attach.ContentId + fileversion.FileExtension;
    m.Attachments.Add(mattach);
}

// Update with attachments
await m.UpdateAsync();
// Send the message
await m.SendAsync();

