email, by user

I want to set up a standard user account for an adult and one for a child
(with parental controls set for the child as well). When the adult opens the
email reader in Vista (is that Outlook Express or ??), I would like them to
have to sign in to their email account. Same for the child. Is that
possilbe in Vista?

What I specifically want is for people to have to sign into their email and
not see everyone else's email before, or after sign-in (similar to the way
AOL makes you sign in with a screen name before you get to your mail, and
then it's only your mail).

Thanks,
Mike