The From field in a meeting request does not list all accounts in Outlook 2010 and Outlook 2013
Original KB number: 978809
When you open a meeting request in Microsoft Outlook 2013 or Outlook 2010, the From field does not list all accounts. Therefore, you may be unable to switch to the account that you want to send the meeting request from.
To send a meeting request from the correct account, close the meeting request. Then, switch to the calendar for your intended account before you create a new meeting request.