High Quality Content by WIKIPEDIA articles! 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. The first version of Exchange ActiveSync (called AirSync at the time) was a part of Microsoft Information Server (MIS) 2002.This version of EAS communicated over Web-based Distributed Authoring and Versioning (WebDAV) to Exchange 2000 servers syncing Email, contacts, and calendar and allowed users to select a folder list to sync but this was only for email folders (not contacts or calendar). This initial version of EAS has the user’s device “pull” data down rather than have the server “push” new information as soon as it was available.

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