Not sure if you can do this. As you know you can receive mail from any pop3 account through AOL, but to send mail you have to use their own, [AOL] system. and Outlook or Outlook Express will not send through AOL.
If you go to "Keyword" and type in "Communicator" you can download the AOL multi-email program.
From this you can send/receive mail in any form through AOL. It's a new release from AOL [Not a BETA] and is designed for the purpose you want, looks very much like Microsoft outlook.
A little more info. to the above. With my AOL account, my son could log in to AOL on my PC, then use his Hotmail, or yahoo to send/receive emails to his own account and receive from his friends, but O/E would not work, AOL will just refuse to recognise it. j.
with Outlook Express, you can collect email from all accounts that you have set up to receive - - but you can only send email from the account belonging to the ISP you are on at that time. My Outlook Exprees picks up btopenworld, tiscali and ntl - -and picks up these no matter what isp I am signed onto - - -but if I am on ntl, I can only send from the ntl one. You can, of course, when replying to, say, your tiscali email, and being signed onto ntl, you can change the drop down menu thingy in the 'from' box. There, clear as mud ain't it ????? I'll get me coat - -