EWS applications and the Exchange architecture | Microsoft Learn
https://learn.microsoft.com/en-us/exchange/client-developer/exchange-web-services/ews-applications-and-the-exchange-architecture
WEBJan 17, 2019 · Exchange Web Services (EWS) is a cross-platform API that enables applications to access mailbox items such as email messages, meetings, and contacts from Exchange Online, Exchange Online as part of Office 365, or on-premises versions of Exchange starting with Exchange Server 2007.
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