Outlook multiple user issue.

Hi,  
       Let me clearify my question : I have about ten users using a single machine. Each of these users have their own email addresses. They login in to the computer as the domain (LAN) users and once they logged in, the outlook express is setup for that user's email address specifically. However the problem is that once the User A has check his email (the email remain in the inbox of outlook which is what I want ) and logged out; User B can sign in with user B's id on the the same computer and his email account is also setup under outlook express (he has different email address, yes I have check the email server and the account for this user so that it is setup with correct credentials and has no conflicts) but the items in the inbox are all mixed up and the user B can aslo see the emails of user A, B,C,D, etc (it goes for all the users, can see the inbox when they sign in and see the inbox item of all the user combined together and sent, draft, etc combine together). So, this is causing alot of pain. is there any way to setup outlook express so that it will not mixed up of different user emails in the inbox, sent, etc. Or Outlook express has the ability to do this? By the way the computer is using WIN 95 and it is on NT domain.

Your help will be much appreciated.

Thanks