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What are the differences between Office 365 APIs and EWS (Exchange Web Services) ?
When do I use one or another?
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Exchange Web Services (EWS) is an application program interface (API) that allows programmers to access Microsoft Exchange items such as calendars, contacts and email.
EWS is a comprehensive service that your applications can use to access almost all the information stored in an Exchange Online, Exchange Online as part of Office 365, or Exchange on-premises mailbox.
Microsoft Graph offers improvements over EWS in terms of security, simplicity, and efficiency. Switch to Microsoft Graph to take advantage of these improvements, all through one single endpoint.
“We will also remove the ability to register new apps in Azure with EWS permissions starting September 30, 2022. Apps registered before this date, any API not mentioned in this, or subsequent announcements, will not be impacted.” This essentially meant that EWS in Exchange Online was going to be turned off.
Office365 API only works for Office365, while EWS works for any Exchange server from Exchange2007 up (including Office365). Other than that:
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