How do I get someone麓s Hotmail e-mail address?

How do I get someone麓s e-mail address from Hotmail? I have their MSN messenger username and I tried to add them as a buddy contact but when I tried to add it said that I also had to type in the e-mail address but I dont know the email-only the username so how can I get their e-mail address to add them as a contact?
How do I get someone麓s Hotmail e-mail address?
Check their profile, if it is there then you can have it. If it is not there, the only option is to ask the person. Send an Instant message and ask for his/her Email address.