How do I find info (such as a profile, or info about when they joined,
or when profile was last updated, etc.) about a specific hotmail user?
 What I have are several hotmail email addresses, and I'd like to
verify that they are "real" and, if they are, when they were created. 
I need to do this in a way other than by simply emailing them.

The brief answer: You can't. I doubt that Microsoft will publish this data.

Scriptor

Scriptor - thanks.  Is this something unique to Microsoft?  Yahoo, for
example, allows you to search its members database.  Hotmail has a
similar feature, but it's too specific.  I can't do general searches
based on their interests, but it also doesn't pull anything up when I
enter in the email addresses/user names that I have.