They are also great ways to experience what it's like to have lots of spyware. Keep in mind, you are giving them your email address and password and msn.com doesn't have anything to do with this.
The safe way to check as to wether someone has taken you off their msn list is:
to go to "personal settings"
then click on "privacy"
click the "view" button (center of page)
and a list will come up of whos address you've been added to. If you're concerned about someone you feel may have deleted you that would be how you check. If they are not in that list, you aren't on theirs.