I need to hide the mail header as default to get more space for mail content.
I tried searching with Google and got nothing helpful.
I found out that I can toggle showing/hiding the mail header by using Message/Move/Actions/Other Action/Message Header. Then, my mail would look like this, with mail content and a compact header to give us more space to read mail.
But I can't find any way to make this view style default.
I don't agree with MadBoy, my outlook 2010 still show header even I've close it just before.