Peter, yes, you got me going...
I noticed that "either" as well. Then I realized is was just a case of a lazy copywriter. Later on the page, the OS 9 instructions have the exact same wording except they add "system folder".
QUOTE
All your mailboxes, mail folders, address books, signatures, stationery, and settings are stored in the Eudora Folder. Copy this entire folder to the new computer and place it in either the Documents folder or the System Folder on the new computer.
I think they just cut out "or the System Folder" and used the same paragraph not noticing the "either" was left wanting...
And the transvestite reference gave me a doubletake, too.