A user has to own and log into a Hotmail account to find out if another person has a Hotmail address. Hotmail has a directory similar to a phone book that contains a list of names of users and their respective Hotmail addresses. Web email directories can help as well.
On the MSN Hotmail Directory, a user can type in the name or phone number of the person whose email address is being sought. Web directories may allow for a nationwide or state-level search. These platforms also allow a user to find the name of person if his email address is known.