I've mostly been happy with Postbox since I moved from Eudora. It's a commercial fork of Thunderbird with some extras. http://postbox-inc.com http://postbox-i

I've mostly been happy with Postbox since I moved from Eudora. It's a commercial fork of Thunderbird with some extras. http://postbox-inc.com http://postbox-inc.com Alas I've been having problems with v4 (including frequent hanging related to their timeboxing "Time Spent Writing" timer), so I can't endorse it as much as I used to. I'm also frustrated that the address book doesn't include Google Contacts integration. Email is critical to me, and I'd happily pay $50 - $100 / year for the perfect cross-platform email client. (Postbox is only $15, which is ridiculously cheap for the value I get from it.)