You can add other pop3 email accounts to your "master" account. From your email account page go to options/moreoptions/sendreceivemailwithadifferentaccount. You can even add separate folders which keeps the different addresses segregated. I'm able to send/receive emails from gmail/yahoo accounts in one place.If you have a problem with another hotmail account, you can link them or forward email from one to the other.
Or you can set up accounts for different email addresses within Outlook or Windows Live Mail. Either works.