I was thrilled to see on the PGP site http://www.pgp.com/products/desktop/home/features.html that it now supports Eudora at long last!!
So I purchased the upgrade and downloaded it, and the documents in the download explicitly omit Eudora as a supported email application.
I've complained to PGP but get no response.
I'm very disappointed.
In the downloaded Read Me pdf file it says:

Email Client Compatibility
PGP Desktop supports the SMTP, POP3, and IMAP4 protocols. The following email
clients are supported:
• Apple Mail 1.3.9
• Microsoft Entourage 2004
Other email clients using the supported protocols may work, but have not been certified
for use.