Exchange Web Service (EWS) for Outlook 2011 for Mac?

Can you help me understand please?
I learnt Outlook 2011 for Mac uses EWS protocol for doing emails. How about the Outlook 2010 or 2007 for Windows? Do they use EWS as well?

Also, inside my office my Outlook for Windows connects to Exchange server through the LAN. What protocol does my Outlook use to connect the Exchange for doing emails?

In terms of efficiency, is EWS slower?
CastlewoodAsked:
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Joshua GrantomSenior Systems AdministratorCommented:
Only Outlook 2011 for Mac uses EWS.

Windows versions of Outlook uses MAPI, RPC, and other protocols.

EWS should not be slower but there are many factors that could effect this, server hardware, availability, throttling policies, etc..

Here is some documentation over the protocols for Exchange.
http://msdn.microsoft.com/en-us/library/cc307725%28EXCHG.80%29.aspx
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