I will try to explain this, but it might be a challenge. 

I have primary Microsoft account.  I use this for my windows phone, my xbox, and my windows 8 machines.  A while back, I jumped on the bandwagon and grabbed an outlook.com account separate from my Microsoft account because I wanted "my name" @outlook.com.

I currently have my main Microsoft account which I use for everything(uses a gmail email address), and a separate outlook.com email.

I want my outlook.com address to be my main address and login for everything, but when I go to switch my address on my account it says that I cannot switch to an existing account. 

How can I make this happen?