How change email to come & go through Outlook instead of My MSN?

I have used My Msn for an email address (msn.com) for many years as a
personal address. Now in a new home office, I want to have all mail come and
go through OUTLOOK. (I want the benefits of OUTLOOK). Here's the problem.
Even when I (think) I have set the defaults to use OUTLOOK, mail still is
only coming in through My MSN. If I purposely write and send a message
through OUTLOOK, the reply will come into OUTLOOK, but I don't know it came
unless I'm in OUTLOOK. How can one msn.com account be working through 2
different sites? Can someone plese help me get everthing into OUTLOOK? Thanks