My wife uses that e-mail client and it suddenly won't open (opens for 1 second and closes). Re-installing without uninstalling the broken program did not help.
I'm afraid that uninstalling the program before re-loading it would lose the address book. I can find the mail files and save them, but apparently address book info is not in identifiable files that I (or a new e-mail client for that matter) can find and import. As I understand it, you have to export your addresses to a text file and then import that to the new app. Presumably the same would apply when uninstalling and re-installing Netscape 4.7 in order to solve the problem of failure to open.
Thanks,
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.7) Gecko/20050414 Firefox/1.0.3


