Exchnage programming API interface being used by Outlook and OWA

Hello,
What Exchnage programming interface (RPC or EWS) is being used by versions of OWA 2007...2013?
Similarly, what Exchnage programming interface (RPC or EWS) is being used by versions of Outlook 2003...2013?
Thank you,

OWA is a private application so the API's and methods it uses aren't publically documented or usable outside of OWA. What is documentd are the Exchange Protocols
http://msdn.microsoft.com/en-us/library/cc425499(v=exchg.80).aspx .
On Exchange 2013 if you have a look at how OWA work's with something like fiddler you'll see that EWS is being used but not directly it get's serialized as JSON . However as OWA does a number of things you can't do in EWS, so I would say it would be
a combiniation of EWS and custom RPC libraries. Older version would be more towards RPC with EWS being used for somethings.
The public API's you can use are EWS and MAPI
Cheers
Glen

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... I reinstalled the os after the new mem sticks.
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Exchnage programming API interface being used by Outlook and OWA

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