How do I send mail from outlook alias id

I converted to Outlook (did not rename my account) and added an Outlook alias. When I send mail from my Live account, I don't see a way to set the default 'From Email ID' as my Outlook alias. I can set the reply to as the alias, but not the from ID. Is there some way to do this without renaming the account? I have a windows phone and don't want to go through all the stuff to reset the phone and put everything back on it somehow.