I changed my primary at msn.com to alias at live.com. I wanted to change it back from alias at live.com to primary at msn.com. It says I can't do this, even though the listing under "Account" shows both my origional primary address and my alias with both selections with choices of making either one as "primary" How do I change it back?

Why did I change it in the first place? I had added an alias and the first time I wanted to send a new email the new alias showed up in a pull down menu. But when I wanted to send another new email, the new alias wasn't listed. So I thought if I had changed the primary to the new alias I could then send the necessary emails to various people. After sending to the various people. I pulled down the menu to change the TO to my msn.com email TO address, but it wasn't listed. I want to go back to where my primary email address is: primary AT msn.com. HELP!!!