Physical Drive 0: 15G blank space, 15G Windows 2000
Physical Drive 1: 15G Windows 98, 15G Windows 2000
So there are two options: find out what files the email messages are stored in and copy them, running from the usable Win2K system, or make the old one bootable somehow, boot into it, and do whatever you do in OE to shift the email to the new system.
Also (this is technically a second question but it's related to the same problem) how do I copy the old Firefox bookmarks onto the new system? I can't find a file or folder anywhere in the Firefox directory that looks like it's the right one.