Now, you can download the latest Exchange Web Services (EWS) Managed API 1.2.1 (version 14.03.0067.001) @ two flavors – 64-bit, 32-bit. It provides a managed interface for developing client applications that use Exchange Web Services. 

The latest EWS Managed API 1.2.1 includes new Exchange Web Services (EWS) client logging features for Exchange Online as part of Office 365, as well as some minor bug fixes. It introduces an important change for client applications that target Microsoft Office 365. This change includes the following two new properties on the ExchangeService object:

  • ExchangeService.ReturnClientRequestId – Indicates whether the x-ms-client-request-id header is sent. This is set to true by default.

  • ExchangeService.SendClientLatencies – Indicates whether the client will send client latency information to Exchange Online. This is set to true by default.

For more information, you can refer the articles @ Exchange API-spotting and Exchange Web Services Managed API 1.2.1 SDK page.