With that - Exchange Web Services (EWS) was born. In doing so, most of the new components were re-written to take advantage of standard web-based protocols which were much easier to support and get through firewalls and the like. Beginning with Exchange 2007, Microsoft slowly started segregating all of these components to a new more segmented and supportable architecture. This included access for all email, calender, free/busy (availability), address books, etc.
Originally all Microsoft "Corporate" email clients - Outlook primarily - used the MAPI protocol for all access to Exchange.
A common request we get from customers it how they can block many problematic or unauthorized (and uncontrolled) email clients connecting to their Exchange servers via Exchange Web Services.
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