Published at LXer:

Previously, talking to Exchange without using Microsoft products was pretty much out of the question. The binary MAPI protocol is proprietary and poorly documented. Exchange supports IMAP and POP, but these protocols only give access to emails, not the calendar, address book, todo lists etc. But beginning with version 2007, Exchange now ships with a SOAP interface called Exchange Web Services, or EWS. This interface gives us access to the functions necessary to write clients in any programming language on any platform. This article describes a PHP program to look up, delete and insert items in an Exchange calendar.

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