The URL of Exchange Online Web Service is a URL like "https://" + "Server name" + "/EWS/Exchange.amsx", for example, https://pod51024.outlook.com/ews/exchange.amsx.
You can refer to steps below to find the URL of exchange web service for your mailbox.
- Logon to your e-mail account using Outlook Web App (OWA).
- Click Options > See All Options > Account > My Account > Settings for POP, IMAP, and SMTP access.
- In the list of entries, locate the server name. And the URL of exchange web service for your mailbox is the URL: "https://" + "Server name" + "/EWS/Exchange.amsx"