From "NETWORK WORLD NEWSLETTER: JASON MESERVE on SECURITY AND BUG PATCH ALERT "
* File execution security hole in Eudora 5.1
A flaw in the way Eudora 5.1 handles file attachments could allow for malicious code to be run on the affected system without the user's permission. No patch is currently available, although users are being urged to disable the "Use Microsoft viewer..." option, which is normally turned on by default.
I don't know if this is old news (if so, my apologies) or "breaking" news. I'm not an Eudora user