Mail in Windows 2000

I have Windows 2000 set up on a single machine at home, with several users/family members each having their own logon.

I can easily set up each person to be able to access the internet via different or the same ISP, but how do I set up Outlook Express so that when each (or some) of the users check email, that they share mail folders and address book for the same email address? (That is, so when mail is received while one person is logged on, another user will be able to read that mail when they log on later

At the moment, each user has their own mail folders, inaccessable by others.

Thanks