I am having a similar issue to that of other users.  I would like to use outlook.com to send/receive work emails which originate form our MS exchange 2003 server.  I have confirmed that it is POP enabled.  I have also confirmed that the setting are all correct.  However, I receive an error message stating "There's a problem connecting to the POP3 mail server. "

I attempted to add the same acount with Gmail and it worked just fine.  I can now send/receive the work emails.  It's just not working on outlook.com.  I would rather use outlook.com for this purpose.  Any help would be greatly appreciated.