Eudora email migration When Lion comes out, PPC Rosetta support for the Eudora email app is reported not to be available.

Which contemporary Mac OS X email clients might support the most painless and reliable importing and use of 10 years worth of of Eudora messages, contacts, filters, and settings?  Which current and supported email clients have the largest subset of Eudora's capabilities?

What problems might I encounter during a complete Eudora export, and how might I avoid them?
I've used Eudora Mailbox Cleaner to varied success for a few recent-ish switchers, with the added bonus (for me, at least) that it can import messages from Thunderbird. It is, however, a PowerPC app in itself, so you'd need to run it before upgrading to Mac OS X 10.7 Lion.