I was using outlook locally on a Exchange server. (i know not a good idea) Anyway if you are going to use it to access a mail box DON’T click the remember password. If not next time you log in to the Exchange Management Console it will log on with those credentials and you wont be able to manage your server. It is easy fixed tho. Just go in to the control panel -> Credential Manager find the password you saved a click remove from vault.