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When the original iPhone was released in 2007, its primary accomplishment was a touchscreen user interface that made smartphones accessible to more than just the email-junkie professionals who had previously owned BlackBerry and Palm Treo devices. However, the first iPhone was not very useful. It had limited software and it couldn't easily connect to corporate email. Apple fixed both of those problems a year later with version 2.0, the iPhone 3G, by opening up to third party developers and licensing Exchange ActiveSync from Microsoft so that iPhone could connect to Exchange email, calendar, and contacts.
Photo credit: Apple
If you'd prefer to view this as a text-based list, see the companion blog post.