Email client advice please

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http://www.linuxquestions.org – I have been using Thunderbird for a long time now, but recently I have stared to become less pleased with it. So, I'm looking for a change and thought I'd come here for some opinions. I have a couple of requirements. I use IMAP for my server connections (multiple accounts), but probably all clients these days handle that. Also, I will want a painless way to migrate my address book and some 3GB of saved messages spread over many mbox files. Thanks in advance. (HowTos)