Gmail/Google Apps is by far the best, IMO.
Google provides an MS Exchange facade for Contacts & Calendar - meaning you get "real time" two-way updates on any supporting client. When I update a contact on my iPhone it immediately updates my google contacts accordingly, when I enter an appointment in Google Calendar on my desktop it syncs to my iPhone calendar automatically with alerts & all.
Gmail's IMAP support is awesome - tags work as folders with an IMAP client. Searching is silly fast. Lots of awesome.
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