End of support for Basic Authentication in Exchange Online and ways to downgrade organization’s security for soon to be retired web application

Like I mentioned before, the app will soon be retired, so we are trying to see if there is any way to bypass changing to Microsoft Graph. From the paragraph above I understand that there could be a way, but I don’t know exactly the steps we need to take .

While basic auth is being deprecated EWS is not (eg its still the main API in use in OWA) changing your EWS app to use Modern Authentication using a Library like MSAL is very easy even if you want to cater for basic, Hybrid modern Auth and Modern auth it’s only a very minimal change. this may help https://gsexdev.blogspot.com/2020/06/modifying-your-ews-wsdl-proxy-code-for.html

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