About 5 years too late I'm moving all my email from Eudora via IMAP to "the cloud".
It's becoming apparent that Eudora has mangled the email headers, so when I view any old emails I just see the HTML source.
I can work round it by selecting "Edit as new" and then switching the editor to HTML view, but it would be so neat to have a "View as HTML" button on the mail viewer pane - the way that mail2web.com works.