Exchange ActiveSync Protocol

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Exchange ActiveSync (EAS) is an XML-based protocol that communicates over HTTP (or HTTPS) designed for the synchronization of email, contacts, calendar, tasks and notes from a messaging server to a mobile device. The protocol also provides mobile device management and policy controls. (— Wikipedia, which has a useful history of Exchange ActiveSync versions.)

iOS Version Exchange ActiveSync protocol version
iOS 2.x v2.5
iOS 3.x v2.5, v12.1
iOS 4.x v2.5, v12.1, v14.0
iOS 5.x v2.5, v12.1, v14.0


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