title: Outlook VBA .SendUsingAccount when no account is available
body: <p>Story:
  In Outlook App there is one default/user account and also additional inbox, calendar (let's call it 2nd_Account) etc. added (visible) as folders based on the Exchange Server permission.</p>
  
  <p>I need to programmatically create new appointment item and send it on behalf of 2nd_Account. Problem is that in Application.Session there is only 1 account (the default one).</p>
  
  <p>If done manually by user, then item created from 2nd_Account olCalendar folder is SendOnBehalf of the 2nd_Account, even though it is not included in Accounts collection. Any ideas, please?</p>
  
  <p>Thank you</p>