title: OutlookServicesClient SendMailAsync does not call accessTokenGetter
body: <p>Because it does not call the method it fails with "unauthorized".  My workaround is to create a draft mail using AddMessageAsync which does call the accessTokenGetter and then SendAsync.</p>
  
  <p>Question 1 - Where is the source for this library, it does not appear to be opensource</p>
  
  <p>Question 2 - I'd like to create a wcf data service client instead of this but I'm not sure how as I cant create the service ref by using Add Reference as it requires an Azure AD token.</p>
  
  <p>I'd like to use the Create Rest API Client in the Azure AD but I need a swagger URL for Office 365</p>