Netscape Email Passwords

I am unsing netscape 4.7 mail with some friends and don't want them to see my mail. I can't seem to figure out how to lock them out by using a password protection. Help anyone (Would it help if we upgraded to 6.2?)

 

One option would be to set up different user profiles. That way, each user would select his own profile when opening Netscape, and configure it for his own mail server. Then password protect your profile. See http://help.netscape.com/kb/consumer/19990112-1.html Password Protecting User Profiles in Communicator 4.5x or 4.6x
Details here:
http://www.gemair.com/support/documentation/netscape/multemail/multemail.shtml