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Enabling Basic Authentication or NTLM Authentication:
• Note: Endpoints supports only Basic authentication for on-premise solutions such as
Exchange server.
• Go to Exchange Control Panel > "servers"
• Switch to "Virtual Directories" double click "EWS"
• In EWS click on "Authentication"
• Check the basic authentication check box and click "Save"
Find EWS URL
• Go to Exchange Control Panel > "servers"
• Switch to "Virtual Directories" double click "EWS" > "General"
• Locate the EWS URL