There's an interesting thread in the MacFixIt Forums about bringing Eudora mailboxes into the OS X mail application. It turns out it's possible, but requires a bit of file editing and directory structure creation.
Basically, you need to convert the Mac line-endings in each mailbox file to UNIX style line-endings, and then create a directory structure that matches what mail.app expects to see.
You can read all about it in this MacFixIt forum.
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