From NirSoft Freeware:
When you configure Netscape Communicator 4.x or Netscape 6.x/7.x to automatically remember your mail password, the password is stored on your machine, and you don't need to type the password every time that you want to check your email. However, if you forget your password, Netscape doesn't allow you to recover the password. Netscape 6.x/7.x also allows you to save the passwords of web-sites, and automatically use them when they're needed, but the same problem exists also with web-sites passwords: You can't recover the passwords if they're lost.
This utility can reveal the stored mail password (POP3 server password) for Netscape Communicator 4.x, Netscape 6.x and Netscape 7. It can also reveal the stored web-sites passwords in Netscape 6.x and Netscape 7.