How to Troubleshoot EWS Connection Issues Using EWS Edit…
https://techcommunity.microsoft.com/t5/exchange/how-to-troubleshoot-ews-connection-issues-using-ews-editor/td-p/1567393
WebAug 5, 2020 · To verify if an error is related to application or to your environment, you can use a tool called EWS Editor to connect to the mailbox …
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