Reorganize iPhone email accounts

Hello everybody.
I´m a new iPhone user, and for me is a completely new OS, but i´m surprised how fast is possible to get rid of it.
I only have one config issue for resolving. Is that I cant change the email account order, so when the app is closed and then opened again, the less used email account is showed...
I have selected the prefered account for sending mails, but it dont affects to this issue.
Ive found that if I try to sync email accounts with itunes and outlook, I can select one each time to get this as the first showed on iPhone. Ive tryed this with no results, my iPhone choose the order he wants...
Any ideas?
Thanks a lot for your help.
iOS 4