Exchange 2013 Developer Resources on MSDN

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EWS Managed API 2.0 Technical Preview

https://www.microsoft.com/en-us/download/details.aspx?id=30391

What's new in the EWS Managed API?

https://msdn.microsoft.com/en-us/library/jj220500(EXCHG.80).aspx

101 EWS Managed API 2.0 Code Samples

https://code.msdn.microsoft.com/Exchange-2013-101-Code-3c38582c

Exchange 2013 Preview SDK

https://msdn.microsoft.com/en-us/library/jj162981(office.15).aspx

What's new in EWS in Exchange 2013 Preview?

https://msdn.microsoft.com/en-us/library/jj190903(EXCHG.150).aspx