1. Copy the files in the Mail Account Folder without
the MSF extension. Also copy the SBD folders, which are the subfolders. Delete all files with MSF extensions in the SBD folders.
2. If you have already installed Netscape 7.2, copy these files without the MSF extension to the Mail Account folder located here: C:\Documents and Settings\user_name\Application Data\Mozilla\Profiles\profilename\*.slt\Mail\pop.isp.net
May I suggest that you forgo Netscape 7.2, due to security vulnerabilities, and instead install Firefox 1.0.4, which is a browser only, or Mozilla 1.7.8, which with a "Custom" install, you can opt out of the Mail program.
3. Sure, you can do that if you don't have a lot of messages.
4. Yes, Eudora is compatible with Netscape, Mozilla, and Firefox. I would imagine that there will be an option in the installation of Eudora for the purpose of migrating Netscape 7.2 Mail. I am not familiar with Eudora, but they do have an excellent KB here: http://www.eudora.com/techsupport/win/#search