Migrating Yahoo! to FastMail.FM: "Yahoo! is unfortunately discontinuing free POP access. You have until April 24 to find another provider or start paying. You can use FastMail.FM to quickly and easily save your emails and address book. FastMail.FM provides, for free, access to IMAP. IMAP is a great system that provides everything that POP does and much more. The good news is that FastMail.FM has prepared a toolkit to allow you to migrate all of your Yahoo! email and addresses to your new FastMail.FM account. The migration process is easy; just follow these instructions."

Smart way from FastMail to try to get users from Yahoo while they're most volatile and likely to change providers.