Issue

– Manager saves unsent email to his Drafts folder in Outlook 2010
– Secretary has manager’s mailbox listed in her Outlook 2010 folders list.
– Secretary accesses her manager’s Drafts folder and sends the email for him with his credentials in the From field (email sends without issue).

Per Outlook 2003 this is a known fault

http://support.microsoft.com/kb/307444

However Outlook 2010 it should not do this

Fix

Go to the From Field and delete all the autocompleted From Fields

Remove the Show From Field and Close Outlook

Reopen Outlook and try again