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Enabling Basic Authentication or NTLM Authentication:
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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