just consider that if you set up Outlook in the manner that Mike describes,, then the mail will be divided to the users by "whomsoever" logs into the mail first...the mail will NOT be replicated between the users,,
so,, if John logs onto his pc and gets the mail,, downloads to his PC,, Suzy comes home, logs in ,, tries to get mail,, but it is either gone to John, or new stuff,, Suzy is expecting an email , but it is now on Johns machine,, either Suzy goes to Johns PC to read and reply, or John would have to forward it via a Web based account to Suzy (hotmail),,,
that is the drawback,,, take it from one who has been EXTREMELY pissed when sharing an account and your Mate has downloaded your mail, but neglects to tell you!!!
But thats another story,,
cheers