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#11
I love the Outlook that comes with the Office Suites.
I realize it can be pricey but I think Outlook 2007 with the Office 2007 Suite is the best e-mail client I have ever used.
I use Outlook 2007 like crazy due to a heavy load for my job, it is a very powerful program in my opinion.
Mozilla Thunderbird is a good free simple e-mail client. However, it really can't do much more than that.