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Microsoft Office 2011 (Mac)
It's far from an ideal solution considering it crashes at least once a day, but it's still the best service for me. I run an Office 365 (Exchange 2010) cloud email solution (see later). While my Mac's in-built email program, Mail, is compatible with Exchange it doesn't support the full range of Exchange features.
Again, it's down to what you know best. There are other email programs and solutions out there, but I've always trusted Microsoft software -- even when it's on a Mac -- and with my decade-long experience of using Windows, a Microsoft-powered solution is what I know best and I'm not one to make radical changes to my workflow.
Sometimes it's a matter of taste and nothing more.