Of course. All of your mailboxes are in the Mail Folder [user directory -> Documents -> Eudora Folder -> Mail Folder] (the exception would be if you also check IMAP accounts, like AOL, with Eudora ... in which case, they would be in the IMAP folder). You can just copy the entire folder from one computer to the other, or just individual mailboxes. I use a back-up program (MimMac) to do this. You can't however, sync individual msgs ... just complete mailboxes.