That's not going to happen unless you pay for the POP3 access for Windows Live Mail... Assuming they have some kind of premium service that offers POP access. You can go the other way around, since Google presently offers free POP (and IMAP) access, but then you have to deal with the ugly and slow Windows Live Mail interface.
You could also do like I did, just set up Thunderbird with the Webmail extension to grab my Hotmail/Windows Live Mail mail. I believe there's even a Portable Thunderbird, that will run entirely from a USB flash drive if you want your mail on the go.
I am trying to make my Google email account add my Microsoft live email, so that Google will check my mail from my Microsoft live account. I keep getting an error
Server denied POP3 access for the given username and password.
Show error details Server returned error: "Command is not valid in this state."
I am using
Username: Full Microsoft Live Email Address
Pop Server: pop.exchangelabs.com
I have checked the password and made sure I was entering the correct one, but still no luck. Any help would be greatly appreciated.