Exchange 2010 AutoConfig

Hi Guys;

i have Exchange 2010 in my environment, on client computer  open Outlook first time and choose auto config (just wrote username and pass ) it says successful  you set your account for outlook but the problem when i check details of account i see that it set as  "IMAP" not exchange. Why ? i dont want to use it as imap where does take this config ? how can i change it ?

Thank u.